Rotting Fields
Land-Plains Swamp (Rare)

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

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

1BB, Tap, Sacrifice Rotting Fields: Target player discards a card.

2, Tap: Target land becomes a 3/3 white Cleric creature until end of turn. It's still a land.

John Deschamps