Moonring Plain
Land-Plains Island (Rare)

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

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

U, Tap, Sacrifice Moonring Plain: Return target creature you control to its owner's hand.

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

John Staples