Mana Vortex

Enchantment    (CMC:3)

Each player who controls land sacrifices one land during his or her upkeep. If at any time there are no lands in play, Mana Vortex is destroyed. If you do not sacrifice a land when Mana Vortex is cast, Mana Vortex is countered.

DK • ENDouglas Shuler

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Mana Vortex {1}{U}{U} Enchantment When you cast Mana Vortex, counter it unless you sacrifice a land. At the beginning of each player's upkeep, that player sacrifices a land. When there are no lands on the battlefield, sacrifice Mana Vortex.

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View this MTG card on Gatherer

10/1/2009
When you cast Mana Vortex, its first ability triggers and goes on the stack on top of the Mana Vortex spell. The triggered ability resolves first. When it resolves, you either sacrifice a land or you counter Mana Vortex.
10/1/2009
Mana Vortex's third ability is a "state trigger." Once a state trigger triggers, it won't trigger again as long as the ability is on the stack. If the ability is countered and the trigger condition is still true, it will immediately trigger again.

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Card Mana Vortex is not on TCGPlayer.