Reborn in Naruto with infinite system

Uzumaki Dax, a soul reborn into the brutal Fourth Great Ninja War era, carries the weight of future knowledge and a terrifying secret: the Infinite Evolution System. This cheat allows him to copy, evolve, and combine any ninjutsu, dojutsu, or bloodline, promising unparalleled power. But Dax is crippled by a past life's regrets, his "mysterious" facade masking a deep-seated fear of losing those he comes to care for in this war-torn world. As the allied shinobi forces crumble against the resurrected threats of Obito and Madara, Dax must decide if he will remain a calculating observer, or unleash his full, untested potential to rewrite history. The fate of the elemental nations, and his own fragile humanity, hangs in the balance. Will he become the savior the world desperately needs, or just another casualty in a war he knew was coming?