Damping Matrix

Artifact, 3 (3)
Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.¹
The priests tried cursing it. The mages tried dispelling it. In the end, they all obeyed it.
Illus. Mike Dringenberg

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/7)	Mirrodin (Rare)