Enchantment — Aura, 2UU (4)
Common (C1)
Enchant creature
Merseine enters the battlefield with three net counters on it.
Enchanted creature doesn't untap during its controller's untap step if Merseine has a net counter on it.
Pay enchanted creature's mana cost: Remove a net counter from Merseine. Any player may activate this ability, but only if he or she controls the enchanted creature.
Illus. Heather Hudson

10/4/2004: Can remove as many counters per turn as you want to and this can be done at any time Instants are legal.
10/4/2004: The cost that needs to be paid includes colored mana requirements.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander