Unstable Ground
Land (Rare)

Unstable Ground enters the battlefield tapped unless you control an enchantment.

R, Tap: Add GG to your mana pool.

G, Tap: Add RR to your mana pool.

2G: Unstable Ground becomes a 2/2 red and green Shaman creature with trample until end of turn. It's still a land.

Mark Prescott