Deathly Chamber
Land-Island Swamp (Rare)

(Tap: Add U or B to your mana pool.)

At the beginning of your upkeep, Deathly Chamber deals 2 damage to target creature you control.

1BB, Tap, Sacrifice Deathly Chamber: Target player discards a card.

2U, Tap: Put a 1/1 blue Crab creature token with flying onto the battlefield.

Greg Avon