Magic: The Gathering · Mirrodin
Assert Authority
French name: Affirmation de l'autorité
Assert Authority (Mirrodin 30) has a market price of US$0.35 to US$3.66 as of Nov 8, 2026.
Price guide
The market price on TCGplayer, in US dollars: a guide, not an offer.
Market price
As of Nov 8, 2026 · The market price is TCGplayer’s, in US dollars. It is a guide, not an offer.
Card details
- Type
- Instant
- Mana cost
- {5}{U}{U}
- Artist
- Greg Hildebrandt
Card text
Affinity for artifacts (This spell costs 1 less to play for each artifact you control.) Counter target spell. If it's countered this way, remove it from the game instead of putting it into its owner's graveyard.
About this card
Assert Authority is card 30 in Mirrodin, a Magic: The Gathering set released Oct 3, 2003. Rarity: Uncommon. Finishes: Normal, Foil. Illustrated by Greg Hildebrandt. Reference market price on Nov 8, 2026: US$0.35 (Normal), US$3.66 (Foil). Over the last 30 days, the Normal price went up 6.1%. Source: TCGplayer market data via tcgcsv.com, updated daily. A reference price is not an offer.
