Mistveil Conclave
Land (Rare)

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

1, Tap: Add WW, WU or UU to your mana pool. Mistveil Conclave deals 1 damage to you.

W, Tap: Mistveil Conclave deals 1 damage to target attacking creature.

Justin Staples