Merseine 
Enchantment — Aura
Enchant creature This Aura enters with three net counters on it. Enchanted creature doesn't untap during its controller's untap step if this Aura has a net counter on it. Pay enchanted creature's mana cost: Remove a net counter from this Aura. Only the controller of the enchanted creature may activate this ability.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL