Mana Vortex | Magic: The Gathering
Formats Mana Vortex is Legal in
Official Oracle Text for Mana Vortex
At the beginning of each player's upkeep, that player sacrifices a land.
When there are no lands on the battlefield, sacrifice Mana Vortex.
Official Rulings for 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.