Assert Authority
MRDMirrodin/#30/2003Uncommon
Colour IDMV 7
Current paper retail
Card Kingdom$0.79
Cardmarket€0.17
ManaPool$0.15
TCGplayer$0.35
Buylist (dealers pay)
Card Kingdom$0.20
MTGO (Cardhoarder)
retail$0.03 tix
Paper retail history (USD)
3 providers
Latest $0.79High $0.99Low $0.35▲ 125.7%
Market and collecting
Market overview
$0.35TCGplayer, USD, retail, nonfoil
Latest observation: 2026-11-08
7d▼ 2.8%30d▲ 12.9%90d▲ 29.6%
90d high
$0.36
90d low
$0.27
Paper printings priced
1
Currently 1st
Cheapest paper printing
$0.35
Mirrodin
- Up 12.9% over the last 30 days on TCGplayer.
- Currently 3% below its 90 day high of $0.36.
- Foil copies of this printing carry a 946% premium over nonfoil.
Find this printing on eBayView on TCGplayerAffiliate. MTGPrices may earn from qualifying eBay and TCGplayer purchases.
Collect
Play
Compare printings (1 priced)
Gameplay and rules
Instant
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.
Keywords
Affinity
Card capabilities
Derived deterministically from card types, Oracle text and keywords. Not a strategic evaluation.
Format legality
Primary formats
Eternal formats
Digital formats
Rulings
No rulings recorded for this card.
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About this card
Assert Authority
Assert Authority is an Instant, with mana cost {5}{U}{U} (mana value 7).
Format legality: Commander: legal, Modern: legal, Standard: not_legal, Pioneer: not_legal, Legacy: legal, Pauper: not_legal.
Current headline price on TCGplayer: $0.35 (up 12.9% over 30 days).
Frequently asked
Assert Authority FAQ
How much is Assert Authority worth?
The current TCGplayer USD retail price for Assert Authority is $0.35. It is up 12.9% over the last 30 days. Over 90 days it has ranged from $0.27 to $0.36.
What is the cheapest printing of Assert Authority?
The cheapest currently priced paper printing is from Mirrodin at $0.35 on TCGplayer.
What set was Assert Authority first printed in?
The earliest English paper printing that MTGPrices tracks is from MRD #30, released 2003-10-02.
Is there a foil version of Assert Authority?
Yes. On this printing, foil copies trade at $3.66 versus $0.35 for nonfoil, which is 946% more expensive on TCGplayer.
Is Assert Authority legal in Commander?
Yes, Assert Authority is currently legal in Commander per Scryfall's legality feed.
Is Assert Authority legal in Modern?
Yes, Assert Authority is currently legal in Modern per Scryfall's legality feed.
Is Assert Authority legal in Standard?
Assert Authority is not currently legal in Standard per Scryfall's legality feed.
What does Assert Authority do?
Assert Authority is an Instant with mana cost {5}{U}{U}. Its Oracle text reads: "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.".