Tranquil Canopy
Land (Rare)

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

Tap: Add G or W to your mana pool.

GW: Tranquil Canopy becomes a 2/1 white and green Kor creature until end of turn. It's still a land.

Christopher Schuler