Power Artifact | Magic: The Gathering
Formats Power Artifact is Legal in
Official Oracle Text for Power Artifact
Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
Official Rulings for Power Artifact
10/4/2004 : Can be placed on artifacts with no or zero activation costs, but this has no effect on them. It does not increase the cost to one.
7/15/2006 : Can't reduce Snow mana costs.
7/1/2013 : Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities; they have colons in their reminder text.