Hydra

Commanders

Gargos, Vicious WatcherGargos, Vicious Watcher card image (m20) 172 #r3184
Grakmaw, Skyclave RavagerGrakmaw, Skyclave Ravager card image (znr) 223 #r7107
Gyrus, Waker of CorpsesGyrus, Waker of Corpses card image (c18) 41 #r13399
Polukranos Reborn // Polukranos, Engine of RuinPolukranos Reborn // Polukranos, Engine of Ruin card image (mom) 300 #r10337
Polukranos, UnchainedPolukranos, Unchained card image (thb) 342 #r7562
Polukranos, World EaterPolukranos, World Eater card image (ddl) 43 #r6494
ProgenitusProgenitus card image (con) 121 #r5529
The Goose MotherThe Goose Mother card image (woe) 204 #r4909
Ulasht, the Hate SeedUlasht, the Hate Seed card image (gpt) 136 #r7744
Zaxara, the ExemplaryZaxara, the Exemplary card image (c20) 20 #r4147

Changeling Commanders

Mistform UltimusMistform Ultimus card image (lgn) 47 #r16698 (changeling)
Moritte of the FrostMoritte of the Frost card image (khm) 328 #r4015 (changeling)
Morophon, the BoundlessMorophon, the Boundless card image (mh1) 1 #r1667 (changeling)

Other Creatures

Ancient HydraAncient Hydra card image (nem) 76 #r25656
Apex DevastatorApex Devastator card image (cmr) 674 #r1238
Apocalypse HydraApocalypse Hydra card image (con) 98 #r7218
Balduvian HydraBalduvian Hydra card image (ice) 173 #r24639
Benevolent HydraBenevolent Hydra card image (j22) 38 #r3142
Bioessence HydraBioessence Hydra card image (war) 186 #r11621
Briar HydraBriar Hydra card image (dmu) 427 #r11891
Bristling HydraBristling Hydra card image (kld) 147 #r13799
CapricopianCapricopian card image (c20) 58 #r5573
Clockwork HydraClockwork Hydra card image (tsp) 253 #r13870
Domesticated HydraDomesticated Hydra card image (cn2) 63 #r13581
Feral HydraFeral Hydra card image (ala) 131 #r6576
Genesis HydraGenesis Hydra card image (m15) 176 #r1854
Goldvein HydraGoldvein Hydra card image (potj) 167s #r10505 #NEW
Heroes' BaneHeroes' Bane card image (pjou) 126★ #r6205
Honored HydraHonored Hydra card image (akh) 172 #r13130
Hooded HydraHooded Hydra card image (ktk) 136 #r2382
Hungering HydraHungering Hydra card image (m19) 189 #r2590
Hydra BroodmasterHydra Broodmaster card image (jou) 128 #r3345
Hydra OmnivoreHydra Omnivore card image (cmd) 161 #r4173
Hydroid KrasisHydroid Krasis card image (rna) 183 #r1803
Ironscale HydraIronscale Hydra card image (thb) 296 #r7069
Kalonian HydraKalonian Hydra card image (m14) 181 #r1352
Khalni HydraKhalni Hydra card image (roe) 192 #r10863
Lifeblood HydraLifeblood Hydra card image (c14) 45 #r3320
Managorger HydraManagorger Hydra card image (ori) 186 #r801
Mistcutter HydraMistcutter Hydra card image (ths) 162 #r3380
Molten HydraMolten Hydra card image (ulg) 85 #r20827
Nessian Wilds RavagerNessian Wilds Ravager card image (pbng) 129★ #r9705
Neverwinter HydraNeverwinter Hydra card image (afc) 41 #r3908
Oran-Rief HydraOran-Rief Hydra card image (pbfz) 181s #r4089
Phyrexian HydraPhyrexian Hydra card image (mbs) 85 #r7834
PhytohydraPhytohydra card image (rav) 218 #r12321
Primordial HydraPrimordial Hydra card image (m12) 189 #r2526
Protean HydraProtean Hydra card image (m10) 200 #r4544
Rampant RejuvenatorRampant Rejuvenator card image (nec) 70 #r2722
Ramunap HydraRamunap Hydra card image (hou) 130 #r11791
Rock HydraRock Hydra card image (lea) 171 #r22541
Savageborn HydraSavageborn Hydra card image (dgm) 100 #r7318
Scourge of Skola ValeScourge of Skola Vale card image (bng) 137 #r10588
Shivan DevastatorShivan Devastator card image (gdy) 6 #r2948
Spitting HydraSpitting Hydra card image (sth) 99 #r25263
Sprouting PhytohydraSprouting Phytohydra card image (dis) 95 #r13234
Steelbane HydraSteelbane Hydra card image (eld) 322 #r2087
Stumpsquall HydraStumpsquall Hydra card image (cmr) 367 #r9103
Thunderous SnapperThunderous Snapper card image (eld) 215 #r9106
Ulvenwald HydraUlvenwald Hydra card image (soi) 235 #r2448
Vastwood HydraVastwood Hydra card image (m14) 198 #r3726
Voracious HydraVoracious Hydra card image (m20) 200 #r2317
Whiptongue HydraWhiptongue Hydra card image (c18) 36 #r4613
Wildwood ScourgeWildwood Scourge card image (m21) 214 #r4625
Wren's Run HydraWren's Run Hydra card image (mh2) 183 #r6139

Other Changelings

Amoeboid ChangelingAmoeboid Changeling card image (lrw) 51 #r4036 (changeling)
Amorphous AxeAmorphous Axe card image (mh1) 219 #r11060 (changeling)
ArachnoformArachnoform card image (khm) 159 #r12403 (changeling)
Avian ChangelingAvian Changeling card image (lrw) 4 #r7577 (changeling)
Blades of Velis VelBlades of Velis Vel card image (lrw) 152 #r9448 (changeling)
Bloodline PretenderBloodline Pretender card image (khm) 235 #r1323 (changeling)
Cairn WandererCairn Wanderer card image (lrw) 105 #r8301 (changeling)
Chameleon ColossusChameleon Colossus card image (mor) 116 #r3540 (changeling)
Changeling BerserkerChangeling Berserker card image (lrw) 160 #r9528 (changeling)
Changeling HeroChangeling Hero card image (lrw) 9 #r11715 (changeling)
Changeling OutcastChangeling Outcast card image (mh1) 82 #r602 (changeling)
Changeling SentinelChangeling Sentinel card image (mor) 6 #r14549 (changeling)
Changeling TitanChangeling Titan card image (lrw) 200 #r10191 (changeling)
Crib SwapCrib Swap card image (lrw) 11 #r2113 (changeling)
Ego ErasureEgo Erasure card image (lrw) 59 #r19321 (changeling)
Fire-Belly ChangelingFire-Belly Changeling card image (lrw) 164 #r9121 (changeling)
Game-Trail ChangelingGame-Trail Changeling card image (mor) 123 #r11129 (changeling)
Ghostly ChangelingGhostly Changeling card image (lrw) 116 #r12225 (changeling)
Gladewalker RitualistGladewalker Ritualist card image (khm) 392 #r14925 (changeling)
GraveshifterGraveshifter card image (mh1) 94 #r2872 (changeling)
Guardian GladewalkerGuardian Gladewalker card image (khm) 174 #r5474 (changeling)
Impostor of the Sixth PrideImpostor of the Sixth Pride card image (mh1) 14 #r6377 (changeling)
Irregular CohortIrregular Cohort card image (mh1) 15 #r3238 (changeling)
Littjara Glade-WardenLittjara Glade-Warden card image (khm) 182 #r12595 (changeling)
Littjara KinseekersLittjara Kinseekers card image (khm) 66 #r11650 (changeling)
Masked VandalMasked Vandal card image (khm) 184 #r1233 (changeling)
Maskwood NexusMaskwood Nexus card image (khm) 240 #r518 (changeling)
Mirror EntityMirror Entity card image (lrw) 31 #r650 (changeling)
Mistform DreamerMistform Dreamer card image (ons) 93 #r24995 (changeling)
Mistform MaskMistform Mask card image (ons) 94 #r18779 (changeling)
Mistform MutantMistform Mutant card image (ons) 95 #r16876 (changeling)
Mistform SeaswiftMistform Seaswift card image (lgn) 45 #r25635 (changeling)
Mistform ShriekerMistform Shrieker card image (ons) 96 #r26236 (changeling)
Mistform SkyreaverMistform Skyreaver card image (ons) 97 #r26323 (changeling)
Mistform SliverMistform Sliver card image (lgn) 46 #r19783 (changeling)
Mistform StalkerMistform Stalker card image (ons) 98 #r25302 (changeling)
Mistform WakecasterMistform Wakecaster card image (lgn) 48 #r24065 (changeling)
Mistform WallMistform Wall card image (ons) 99 #r23919 (changeling)
Mistform WarchiefMistform Warchief card image (scg) 43 #r13652 (changeling)
MistwalkerMistwalker card image (khm) 68 #r9369 (changeling)
Moonglove ChangelingMoonglove Changeling card image (mor) 67 #r11538 (changeling)
Mothdust ChangelingMothdust Changeling card image (mor) 42 #r3103 (changeling)
Nameless InversionNameless Inversion card image (lrw) 128 #r9148 (changeling)
RealmwalkerRealmwalker card image (khm) 399 #r487 (changeling)
Runed StalactiteRuned Stalactite card image (lrw) 260 #r11377 (changeling)
ShapesharerShapesharer card image (lrw) 85 #r7260 (changeling)
Shields of Velis VelShields of Velis Vel card image (lrw) 39 #r7368 (changeling)
Skeletal ChangelingSkeletal Changeling card image (lrw) 140 #r7640 (changeling)
Taurean MaulerTaurean Mauler card image (mor) 109 #r931 (changeling)
Turtleshell ChangelingTurtleshell Changeling card image (lrw) 94 #r15254 (changeling)
Universal AutomatonUniversal Automaton card image (mh1) 235 #r1449 (changeling)
Unsettled MarinerUnsettled Mariner card image (mh1) 216 #r3350 (changeling)
Valiant ChangelingValiant Changeling card image (mh1) 34 #r7362 (changeling)
Venomous ChangelingVenomous Changeling card image (mh1) 114 #r7756 (changeling)
War-Spike ChangelingWar-Spike Changeling card image (mor) 112 #r14289 (changeling)
Webweaver ChangelingWebweaver Changeling card image (mh1) 192 #r10376 (changeling)
Wings of Velis VelWings of Velis Vel card image (lrw) 97 #r11886 (changeling)
Woodland ChangelingWoodland Changeling card image (lrw) 242 #r7021 (changeling)

Hydra Support Cards

Hydra's GrowthHydra's Growth card image (thb) 172 #r1377
Lair of the HydraLair of the Hydra card image (afr) 356 #r2138

Generic Support cards

Adaptive AutomatonAdaptive Automaton card image (m12) 201 #r1499
An-Zerrin RuinsAn-Zerrin Ruins card image (hml) 64 #r20854
Arcane AdaptationArcane Adaptation card image (xln) 46 #r2630
Ashes of the FallenAshes of the Fallen card image (sok) 152 #r15062
Belbe's PortalBelbe's Portal card image (nem) 127 #r7122
Brass HeraldBrass Herald card image (apc) 133 #r9315
Caller of the HuntCaller of the Hunt card image (mmq) 233 #r17207
Cavern of SoulsCavern of Souls card image (avr) 226 #r133
Circle of SolaceCircle of Solace card image (ons) 13 #r24652
ConspiracyConspiracy card image (mmq) 127 #r6810
Cover of DarknessCover of Darkness card image (ons) 133 #r3825
Doom CannonDoom Cannon card image (ons) 307 #r22545
Door of DestiniesDoor of Destinies card image (pmor) 143★ #r884
Elvish SoultillerElvish Soultiller card image (lgn) 124 #r16518
Engineered PlagueEngineered Plague card image (ulg) 51 #r16176
Etchings of the ChosenEtchings of the Chosen card image (mh1) 198 #r2165
From the RubbleFrom the Rubble card image (lcc) 72 #r8948
Herald's HornHerald's Horn card image (c17) 53 #r139
Icon of AncestryIcon of Ancestry card image (m20) 229 #r1508
Instruments of WarInstruments of War card image (j22) 50 #r9800
Kindred BoonKindred Boon card image (c17) 5 #r6179
Kindred DiscoveryKindred Discovery card image (c17) 11 #r353
Metallic MimicMetallic Mimic card image (aer) 164 #r1121
Mirror of the ForebearsMirror of the Forebears card image (c17) 54 #r6856
Molten EchoesMolten Echoes card image (c20) 54 #r1608
Obelisk of UrdObelisk of Urd card image (m15) 222 #r2259
Pillar of OriginsPillar of Origins card image (xln) 241 #r3841
Plague EngineerPlague Engineer card image (mh1) 100 #r11310
Progenitor's IconProgenitor's Icon card image (lcc) 68 #r6659
Radiant DestinyRadiant Destiny card image (rix) 18 #r4486
Rally the RanksRally the Ranks card image (khm) 336 #r3095
Reflections of LittjaraReflections of Littjara card image (khm) 73 #r516
Riders of GavonyRiders of Gavony card image (avr) 33 #r7333
Roaming ThroneRoaming Throne card image (lci) 344 #r418
Rukarumel, BiologistRukarumel, Biologist card image (cmm) 776 #r10108
Secluded CourtyardSecluded Courtyard card image (neo) 512 #r278
Shared TriumphShared Triumph card image (ons) 53 #r12542
Species SpecialistSpecies Specialist card image (c20) 47 #r2016
Steely ResolveSteely Resolve card image (ons) 286 #r7224
Titan of LittjaraTitan of Littjara card image (cmm) 760 #r4662
Unclaimed TerritoryUnclaimed Territory card image (xln) 258 #r204
Urza's IncubatorUrza's Incubator card image (uds) 142 #r525
Vanquisher's BannerVanquisher's Banner card image (xln) 251 #r272
XenograftXenograft card image (nph) 51 #r9244

Mentions (name and flavour text)

Aspect of HydraAspect of Hydra card image (bng) 117 #r8412
Distract the HydraDistract the Hydra card image (tfth) 7 #r0
Honored HydraHonored Hydra card image (takh) 7 #r0
HydraHydra card image (tc20) 12 #r0
HydraHydra card image (tjou) 4 #r0
HydraHydra card image (tznr) 9 #r0
Hydra HeadHydra Head card image (tfth) 1 #r0
Phyrexian HydraPhyrexian Hydra card image (tmom) 12 #r0
Phyrexian HydraPhyrexian Hydra card image (tmom) 11 #r0
Playable Delusionary HydraPlayable Delusionary Hydra card image (sunf) 30 #r0

Not (yet?) EDH-legal

Disorienting GlowerDisorienting Glower card image (tfth) 6 #r0
Grown from the StumpGrown from the Stump card image (tfth) 8 #r0
Hydra's Impenetrable HideHydra's Impenetrable Hide card image (tfth) 9 #r0
HydradoodleHydradoodle card image (ust) 112 #r0
Multi-HeadedMulti-Headed card image (ust) 117 #r0
Neck TangleNeck Tangle card image (tfth) 10 #r0
Noxious Hydra BreathNoxious Hydra Breath card image (tfth) 11 #r0
Strike the Weak SpotStrike the Weak Spot card image (tfth) 12 #r0
Swallow the Hero WholeSwallow the Hero Whole card image (tfth) 13 #r0
Torn Between HeadsTorn Between Heads card image (tfth) 14 #r0

Scryfall art tags

https://tagger.scryfall.com/tags/artwork/hydra

#r= gives the edhrec rank of the card; the lower the ranking, the more decks the card is played in.