Amulet of Power

: Planeswalker Equip {3} Whenever equipped planeswalker activates a loyalty ability, put a power counter on Amulet of Power.
-2: Destroy all permanent target payer controls. Activate this ability only if there are 7 or more power counters on Amulet of Power
-5: Gain control of target player. Activate this ability only if there are 13 or more power counters on Amulet of Power