Grassy Furnace
Land (Rare)

Grassy Furnace enters the battlefield tapped.

1, Tap: Add GG, GR or RR to your mana pool. Grassy Furnace deals 1 damage to you.

RG: Grassy Furnace becomes a 2/1 green and red Squirrel creature until end of turn. It's still a land.

Greg Tedin