Destructive Urge
{1}{R}{R}
Enchantment -- Aura
Enchant creature
Whenever enchanted creature deals combat damage to a player, that player sacrifices a land of their choice.
Mana Vortex
{1}{U}{U}
Enchantment
When you cast ~this~, 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~.