Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, copying Abnormal Endurance, with the copy targeting Naru Meha.
Resolve the copy of Abnormal Endurance.
Holding priority, activate Phyrexian Altar by sacrificing Naru Meha.
When Naru Meha dies, it triggers, returning it from your graveyard to the battlefield.
Repeat from step 3.
This clever loop centers around Naru Meha, Master Wizard, whose entry trigger allows her to perpetually duplicate instant or sorcery spells. By targeting Naru Meha with Abnormal Endurance, you grant her a crucial delayed resurrection trigger for the moment she hits the graveyard. Sacrificing her to Phyrexian Altar instantly turns that pending revival into an infinite cascade of enter-the-battlefield and death triggers, all while fueling your mana pool with any color you need.