Sliver Hivelord [Magic 2015] Hydra Avatar you may put that card

you may put that card onto the battlefield

Set: Urza's Saga Type: Creature — Whale Rarity: Rare Cost: {5}{U}{U} When Great Whale enters the battlefield

if enchanted creature has flying

then put all cards exiled with Knowledge Vault into their owner's hand

Set: Rivals of Ixalan Prerelease Promos Type: Creature — Dinosaur Rarity: Mythic Cost: {3}{W}{W} Enrage — Whenever Trapjaw Tyrant is dealt damage

Sliver Hivelord [Magic 2015] Hydra Avatar you may put that cardSet: Magic 2015 Type: Legendary Creature Sliver Rarity: Mythic Cost: {W}{U}{B}{R}{G} Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.) "This is the source, the line unbroken since the calamity that brought such monsters to our shores." Hastric, Thunian scout