Excalibur

+1: Fool! Give all creatures +1/+1. You may use this ability anytime you could play an instant.
-3: Equip Excalibur to a creature. Equipped creature gets +5/+5 and has double strike. At the end of your turn, unequip Excalibur.
-10: Put Equipment artifact token named Excalibur onto the battlefield. Indestructible, Equpped creature gets +5/+5 and has double strike, Equip 0.