Hallowed Wastes
Land (Rare)

Hallowed Wastes enters the battlefield tapped unless you control two or more colorless permanents.

Tap: Add W or U to your mana pool. Hallowed Wastes deals 1 damage to you.

WU: Hallowed Wastes becomes a 2/1 white and blue Spirit Cleric creature until end of turn. It's still a land.

Lars Staples