Bloodstained Mire
Land (Rare)

Bloodstained Mire enters the battlefield tapped.

1, Tap: Add RR, RB or BB to your mana pool. Bloodstained Mire deals 1 damage to you.

1R: Bloodstained Mire becomes a 1/1 black and red Elemental creature with first strike until end of turn. It's still a land.

Allan Schuler