Ringing Strike Mastery - Tarkir: Dragonstorm - 53

Enchantment — Aura

Mana Cost: {U}

Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Enchanted creature has "{5}: Untap this creature."

Common · Tarkir: Dragonstorm · #53 (TDM)

Illustrated by Alexandre Honoré