Scrub Conclave
Land (Rare)

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

B, Tap: Add UU to your mana pool.

U, Tap: Add BB to your mana pool.

3: Scrub Conclave becomes a 2/2 black Zombie creature until end of turn. It's still a land.

Aleksi Guay