Thelon's Chant

Color-hosing aimed at one enemy: the player whose manabase leans on Swamps. The card never stops a Swamp from arriving; it triggers when one enters the battlefield, then asks that player to choose between taking three damage and stapling a -1/-1 counter onto one of their own creatures. The choice always belongs to the affected player, which is why this reads as recurring friction rather than a hard answer: it taxes a land drop instead of denying it. The upkeep payment is the leash that keeps the effect from being free. You spend an extra green every turn to keep the enchantment online, pricing the lock against the value it generates and forcing you to keep believing the Swamp player across from you is worth taxing. That whole shape, antagonistic hosing built around a recurring cost rather than flat denial, and only relevant when a player is actually putting Swamps onto the battlefield, was the design vocabulary of its era, when sets leaned hard on narrowly pointed cards that did nothing against the wrong opponent. The -1/-1 counter clause is the most forward-looking piece here: a small idea that green and black would later build whole mechanical identities around, offered in passing as the lesser of two punishments. Read together, the upkeep cost and the Swamp trigger make the card a standing wager that the table will cooperate by playing black.