Assert Authority [Mirrodin]
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Assert Authority [Mirrodin]

Assert Authority [Mirrodin]

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Set: Mirrodin
Type: Instant
Rarity: Uncommon
Cost: {5}{U}{U}
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.

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