Molten Timberland
Land (Rare)

At the beginning of your end step, if you didn't cast any spells this turn, Molten Timberland deals 1 damage to you.

R, Tap: Add GG to your mana pool.

G, Tap: Add RR to your mana pool.

2G: Molten Timberland becomes a 2/2 red and green Giant creature with trample until end of turn. It's still a land.

Justin Palck