Palace Heath
Land-Plains Swamp (Rare)

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

When Palace Heath enters the battlefield, sacrifice it unless you pay B.

BB, Tap, Sacrifice Palace Heath: Put a -1/-1 counter on target creature.

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

James Deschamps