Rage Shield

When this artifact enters and at the beginning of combat on your turn, put a rage counter on this artifact. At the beginning of your end step if this artifact has 7 or more counters on it, sacrifice it. Equipped creature gets +0/+X, where X is the number of rage counters on this artifact. If X is 2 or greater, equipped creature has haste. If X is 4 or greater, equipped creature has haste and vigilance. If X is 6 or greater, equipped creature has haste, vigilance, and trample. Equip— Remove a rage counter.