(Waterveil of the Burnwillows isn't a spell.)

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.

Sacrifice a land: You gain 1 life.

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