Ulvenwald Hydra [Shadows over Innistrad Prerelease Promos] 186 you can have this card

you can have this card lose 500 ATK and DEF

(You do not use "Polymerization")

exile Eternal Scourge

Set: Seventh Edition Type: Creature — Elf Rarity: Rare Cost: {1}{G}{G} Other Elf creatures get +1/+1 and have forestwalk

Ulvenwald Hydra [Shadows over Innistrad Prerelease Promos] 186 you can have this cardSet: 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.