Instill Energy

Enchant Creature    (CMC:1)

Enchanted creature is unaffected by summoning sickness. : Untap enchanted creature. Use this ability only during your turn and only once each turn.

5E • ENRon Spencer

™ & © 1993—1997 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Instill Energy {G} Enchantment — Aura Enchant creature Enchanted creature can attack as though it had haste. {0}: Untap enchanted creature. Activate this ability only during your turn and only once each turn.

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10/4/2004
If attached to an opponent's creature, you can untap their creature during your turn.
10/4/2004
Instill Energy's untap ability will not untap the creature until it resolves. This means other spells and abilities can be used before it actually becomes untapped.
8/1/2005
Any Auras (or other effects) which are on the creature that would cause it to not be untapped (or have a cost to be untapped) during untap step do not in any way hinder or imply a cost to use this card's ability to untap once during the turn.

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