This clever loop turns Sunstrike Legionnaire into a self-sustaining token machine by leveraging the aura granted by Elemental Mastery. When you tap Sunstrike Legionnaire to activate the enchantment's ability, it generates a rush of 1/1 Elemental creature tokens equal to its power. Because those tokens enter the battlefield, Sunstrike Legionnaire's own triggered ability instantly responds by untapping itself, allowing you to repeat the process immediately for an infinite army of hasty attackers.