Keikai, Forgiven and Graced

Whenever a creature enters the battlefield under your control, put a colorless Equipment artifact token named Assaultforged Blade onto the battlefield. It has "Equipped creature gets +1/+0 and has first strike" and equip {1}.
He's led men out of massacre, led armies to an absolute victory, and led himself into the legends. He can compel men to fight in a single sentence. He must have come from some sort of great nobility, but nobody can seem to pinpoint his true origins.