Argentum Armor

Oracle Text

Equipped creature gets +6/+6.

Whenever equipped creature attacks, destroy target permanent.

Equip 6

Card Rulings

1/1/2011 The second ability triggers and resolves during the declare attackers step. The target permanent will be destroyed before blockers are declared.
1/1/2011 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.