Waterveil Prairie
Land (Rare)

At the beginning of your upkeep, Waterveil Prairie deals 1 damage to target creature you control.

Tap: Add 1 to your mana pool.

Tap: Add W or U to your mana pool. Each opponent gains 1 life.

1: Waterveil Prairie becomes a 2/2 white Kor Spirit creature until end of turn. It's still a land.

John Moeller