Thelon's Chant

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.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oi5jad2appb1h5bzgk4l3.