Gilt-Leaf Karoo
Land-Forest Plains (Rare)

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

When Gilt-Leaf Karoo enters the battlefield, you lose 1 life unless you reveal an artifact land card from your hand.

GG, Tap, Sacrifice Gilt-Leaf Karoo: Destroy target artifact.

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

Justin Pollack