Mistveil Marsh
Land (Rare)

Mistveil Marsh enters the battlefield tapped.

1, Tap: Add WW, WB or BB to your mana pool. Mistveil Marsh deals 1 damage to you.

1W: Mistveil Marsh becomes a 0/4 white and black Bird Spirit creature with defender until end of turn. It's still a land.

Carl Staples