Thirst - Mirage - 99

Enchantment — Aura

Mana Cost: {2}{U}

Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
At the beginning of your upkeep, sacrifice this Aura unless you pay {U}.

Common · Mirage · #99 (MIR)

Illustrated by Roger Raupp