Format legality
- –standardNot legal
- –pioneerNot legal
- ✓modernLegal
- ✓legacyLegal
- ✓vintageLegal
- ✓commanderLegal
- –pauperNot legal
- –brawlNot legal
Assert Authority
Instant - Mirrodin #30 - Uncommon - (EN)
Affinity for artifacts (This spell costs 
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.
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.Loading market prices…
Format legality
- –standardNot legal
- –pioneerNot legal
- ✓modernLegal
- ✓legacyLegal
- ✓vintageLegal
- ✓commanderLegal
- –pauperNot legal
- –brawlNot legal