Cheapest priced copy (Antiquities): $229.99 at Card Kingdom, near mint, their price list as of .
Power Artifact 
Enchantment — Aura · Uncommon · Antiquities · #11
Enchant artifact
Enchanted artifact's activated abilities cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $229.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Antiquities | 11 | Uncommon | $229.99 | — |
4 rulings from Wizards of the Coast
- 4 October 2004Only affects the generic mana part of activation costs. Colored parts of mana costs are not affected.
- 4 October 2004Can 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.
- 15 July 2006Can't reduce Snow mana costs.
- 8 June 2016Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.