Jungle Caldera
Land-Mountain Forest (Rare)

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

Jungle Caldera enters the battlefield tapped unless you control three or more colorless permanents.

GG, Tap, Sacrifice Jungle Caldera: Destroy target artifact.

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

Justin Nielsen