Waterveil of the Burnwillows
Land (Rare)

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

1, Tap: Add UU, UR or RR to your mana pool. Waterveil of the Burnwillows deals 1 damage to you.

UR: Waterveil of the Burnwillows becomes a 2/1 blue and red Shapeshifter Crab creature until end of turn. It's still a land.

Jesper Pollack