Assert Authority
Instant
Card text
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.
Showing Mirrodin#30
Price
0.31 $
Foil 3.70 $
9 printings
Daily estimate from Scryfall, not a shop quote.
Assert Authority keyword rules
Affinity Rule 702.41
Affinity is a static ability that functions while the spell with affinity is on the stack. “Affinity for [text]” means “This spell costs you {1} less to cast for each [text] you control.”
If a spell has multiple instances of affinity, each of them applies.
Assert Authority format legality
Constructed
- StandardNot legal
- PioneerNot legal
- ModernLegal
- Future StandardNot legal
Eternal
- LegacyLegal
- VintageLegal
- PauperNot legal
- PremodernNot legal
- Old SchoolNot legal
- Penny DreadfulNot legal
Commander
- CommanderLegal
- OathbreakerLegal
- Pauper CommanderNot legal
- Duel CommanderLegal
- PreDHLegal
Arena & online
- HistoricNot legal
- TimelessNot legal
- AlchemyNot legal
- GladiatorNot legal
- BrawlNot legal
- Standard BrawlNot legal
- Competitive BrawlNot legal
Other
- TLRNot legal
All printings of Assert Authority 9
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