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Assert Authority
Assert Authority MRD
Printings/Rarity:
Mirrodin Uncommon 
Cost: Mana 5Mana UMana U
CMC: 7
Card Type: Instant
Oracle Text: Affinity for artifacts (This spell costs Mana 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.

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