2+ WATER monsters
If this card is Link Summoned using a Link Monster as a material: You can take 1 card from your Deck that has an effect that Special Summons a Token(s), and either add it to your hand or send it to the GY. You can only use this effect of "Lernaean Hydra Dragon" once per turn. Once per turn, during the Damage Step, when a Spell/Trap Card, or monster effect, is activated (Quick Effect): You can negate the activation. You can banish this card from your GY, then target 1 WATER Link Monster in your GY, except "Lernaean Hydra Dragon"; Special Summon that target, and if you do, Special Summon 1 Level 4 or lower WATER Dragon monster from your hand. You can only use this effect of "Lernaean Hydra Dragon" once per turn.