Mana Vortex [The Dark] Sorin Set: Battlebond Type: Enchantment Rarity:

Set: Battlebond Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever an opponent taps a land for mana

You may cast it without paying its mana cost if it's a spell with lesser mana value

When Knowledge Vault leaves the battlefield

Set: Gatecrash Type: Land — Island Swamp Rarity: Rare ({T}: Add {U} or {B}

you may change "nonred creature" to "nongreen creature" or "plainswalk" to "swampwalk

Mana Vortex [The Dark] Sorin Set: Battlebond Type: Enchantment Rarity:Set: The Dark Type: Enchantment Rarity: Rare Cost: {1}{U}{U} 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. When there are no lands on the battlefield, sacrifice Mana Vortex.