Salt Catacomb
Land (Rare)

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

W, Tap: Add BB to your mana pool.

B, Tap: Add WW to your mana pool.

2: Salt Catacomb becomes a 2/2 white Soldier creature until end of turn. It's still a land.

James Grant West