Just found a “take an extra turn” infinite

Everything completely accidental. The setup, all of it. But if you finish the Kami war saga, have enough mana to cast an extra turn spell, and then swing at your opponent, you get that spell back and essentially infinite turns until you kill your opponent, which shouldn’t take long with. A 6+/6. Setup is difficult and relies on a lot of luck (they could have graveyard hate, removal, or counterspells) but if you get this off it’s an insta win.