Nomad Pool
Land-Plains Swamp (Rare)

(Tap: Add W or B to your mana pool.)

At the beginning of your upkeep, Nomad Pool deals 2 damage to target creature you control.

W, Tap, Sacrifice Nomad Pool: Prevent all combat damage that would be dealt this turn.

2, Tap: Target land becomes a 3/3 black Skeleton Wizard creature until end of turn. It's still a land.

Carl Grant West