Accorder's Shield (SOM 136)

Artifact — Equipment • Mana cost: {0} • Scars of Mirrodin • Common

Equipped creature gets +0/+3 and has vigilance. (Attacking doesn't cause it to tap.)
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

An Auriok shield is polished to a mirror finish even on the inside, enabling its bearer to watch foes ahead and behind.

Illustrated by Alan Pollack.