Assert Authority
Instant
Mana Cost:
{5}{U}{U}
CMC 7
Colors:
U
Set:
Mirrodin (MRD)
Rarity:
Uncommon
Standard
Commander
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.
Deck Archetypes
Counterspell Control
Counters spells with artifact affinity, fits control and counterspell archetypes.