Withering Wisps

Enchantment    (CMC:3)

At the end of any turn, if there are no creatures in play, bury Withering Wisps. Withering Wisps deals 1 damage to each creature and each player. You cannot spend more in this way each turn than the number of snow-covered swamps you control.

IA • ENNéNé Thomas

™ & © 1993—1995 Wizards of the Coast

Legal in: Ice Age Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Withering Wisps {1}{B}{B} Enchantment At the beginning of the end step, if no creatures are on the battlefield, sacrifice Withering Wisps. {B}: Withering Wisps deals 1 damage to each creature and each player. Activate this ability no more times each turn than the number of snow Swamps you control.

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View this MTG card on Gatherer

10/1/2008
Withering Wisps's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless there are no creatures on the battlefield when a turn's end step begins, and (2) the ability will do nothing if there are any creatures on the battlefield by the time the ability resolves.
10/1/2008
If all creatures leave the battlefield during a turn's End step (after any "at the beginning of the end step" triggers would have triggered that turn), Withering Wisps will remain on the battlefield because the trigger condition has already passed.
10/1/2008
The number of snow Swamps you control and the number of times Withering Wisps's ability has been activated so far that turn are checked each time you attempt to activate the ability.

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Card Withering Wisps is not on TCGPlayer.