Assert Authority

Instant, 5UU (7)
Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.¹
Illus. Greg Hildebrandt

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