Rootwater Karst
Land-Forest Island (Rare)

(Tap: Add G or U to your mana pool.)

Rootwater Karst enters the battlefield tapped.

2, Tap: Target land becomes a 3/3 blue Merfolk Cephalid creature until end of turn. It's still a land.

2G, Tap: Regenerate target nonbasic land.

Jason Palck