Grafted Exoskeleton [Scars of Mirrodin]

Set: Scars of Mirrodin Type: Artifact — Equipment Uncommon Cost: {4} Equipped creature gets +2/+2 and has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever Grafted Exoskeleton becomes unattached from a permanent, sacrifice that permanent. Equip {2}