Argentum Armor #202
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Card Details
Equipped creature gets +6/+6.
Whenever equipped creature attacks, destroy target permanent.
Equip 
“Mirrodin's creator still lives, still shapes metal, and still commands world-shaking power.”
Illustrated by Matt Cavotta
Rulings (2)
Jan 1, 2011
The second ability triggers and resolves during the declare attackers step. The target permanent will be destroyed before blockers are declared.
Jan 1, 2011
You may target any permanent with the triggered ability, not just one controlled by the defending player. If no other player controls a permanent, you must target one of your own.
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