Mana Vortex is a rare Enchantment card from The Dark (DRK), collector number 31. Current market price: $14.10, TCGplayer market prices via Scryfall.
When you cast this spell, counter it unless you sacrifice a land. At the beginning of each player's upkeep, that player sacrifices a land of their choice. When there are no lands on the battlefield, sacrifice this enchantment.