Assert Authority
Magic: The Gathering | Mirrodin - Singles
| Rarity | U |
| Number | 30 |
| Printed in | Magic: The Gathering | Mirrodin |
| Available | 27 items |
| From | £0.20 |
| Type | Instant |
Format Legality
About Assert Authority
Assert Authority from Mirrodin is currently available from around £0.20. This panel brings together mana value, rules text, format signals, and set details in one place.
Mana Cost
Mana Value 7Color Identity
BlueCard 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.
Keywords
Card Facts
Expansion
Current Floor
Rarity
Artist
Released
EDHREC Rank
Frequently Asked Questions
How much is Assert Authority worth?
Assert Authority is currently shown on Card Synced from about £0.20 for Mirrodin. This is a live floor on active listings. For MTG singles, foil status and rarity generally have the biggest impact on spread.
Assert Authority currently shows mostly this printing in this view, which can help when comparing direct availability and condition.
Is Assert Authority legal in Commander?
Assert Authority is legal in Commander. It is also legal in Modern.
Is Assert Authority legal in Modern, Pioneer, or Vintage?
This card can differ across formats. Card Synced shows a live legality snapshot from Oracle and updates it as rulings change. Use the legality table above to confirm full format details before buying.
Is Assert Authority on the Reserved List?
No. Assert Authority is not on the Reserved List. That can affect long-term scarcity and collector demand.
What is Assert Authority in-game text?
In game, Assert Authority is a Instant with text that starts: "Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)".
How popular is Assert Authority in Commander decks?
Assert Authority ranks #12,482 on EDHREC for Commander inclusion, which is a proxy for market demand and practical deck usage.
Buy Assert Authority on Card Synced
Looking to buy Assert Authority? Card Synced offers the best prices with 0% seller fees, meaning sellers keep more and can offer better prices. Every purchase includes buyer protection with a 14-day inspection period.
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Searchers looking for Assert Authority legality or value usually care about the same things: current format status, available printings, and whether the card is seeing fresh demand from Commander, Modern, or Pioneer players. This page keeps those signals together.