During your upkeep, pay or bury Thelon's Chant. Whenever a player puts a swamp into play, Thelon's Chant deals 3 damage to him or her unless that player puts a -1/-1 counter on a target creature he or she controls.
FE • ENMelissa Benson
™ & © 1993—1994 Wizards of the Coast
Legal in: Legacy,Vintage,Commander
Oracle Text (click to copy):
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10/4/2004 Damages the player putting the land onto the battlefield, even if they are not the controller of the land after it is on the battlefield. 10/4/2004 Only checks the type of the land as it is put onto the battlefield. If the land gets changed after it enters the battlefield (even by a continuous effect), the Chant causes no additional effect.