Underground-wood
Land-Swamp Forest (Rare)

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

When Underground-wood enters the battlefield, sacrifice it unless you pay B.

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

2GG, Tap: Put a 2/2 green Squirrel creature token onto the battlefield.

Mark Schuler