Disruption Aura

Oracle Text

Enchant artifact

Enchanted artifact has "At the beginning of your upkeep, sacrifice this artifact unless you pay its mana cost."

Card Rulings

12/1/2004 Mana cost includes any requirements for colored mana, although most artifacts don’t have any color requirements.
12/1/2004 If the enchanted artifact has X in its mana cost, X is 0.