Thelon's Chant (Fallen Empires)

At the beginning of your upkeep, sacrifice this enchantment unless you pay {G}. Whenever a player puts a Swamp onto the battlefield, this enchantment deals 3 damage to that player unless the player puts a -1/-1 counter on a creature they control.

NM - $0.70
LP - $0.70
MP - $0.70
HP - $0.70
DMG - $0.70