Grass-Karoo
Land-Forest Plains (Rare)

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

When Grass-Karoo enters the battlefield, sacrifice it unless you pay W.

GG, Tap, Sacrifice Grass-Karoo: Destroy target enchantment.

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

James Nielsen