Ulvenwald Hydra (235) [Prerelease Cards] 'Green' Set: Unlimited Edition Type: Artifact

Set: Unlimited Edition Type: Artifact Rarity: Rare Cost: {1} {1}

Set: Eighth Edition Type: Artifact Rarity: Rare Cost: {5} Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it

you may sacrifice an artifact

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

and always attacks its controller

Ulvenwald Hydra (235) [Prerelease Cards] 'Green' Set: Unlimited Edition Type: ArtifactSet: Shadows over Innistrad Prerelease Promos Type: Creature Hydra Rarity: Mythic Cost: {4}{G}{G} Reach Ulvenwald Hydra's power and toughness are each equal to the number of lands you control. When Ulvenwald Hydra enters the battlefield, you may search your library for a land card, put it onto the battlefield tapped, then shuffle.