Cast Infuse with Vitality by paying its mana cost.
Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, copying Infuse with Vitality, with the copy targeting Naru Meha.
Resolve the copy of Infuse with Vitality.
Holding priority, activate Yahenni by sacrificing Naru Meha.
When Naru Meha dies, it triggers, returning it from your graveyard to the battlefield.
Repeat from step 3.
Resolve all Yahenni abilities from step 5.
This loop is a masterclass in recursive spell-copying and sacrifice, turning a single pumped-up wizard into an endless engine of life and death. By leveraging Naru Meha, Master Wizard's enter-the-battlefield trigger to continuously copy Infuse with Vitality—which targets Naru Meha itself—you set up a safety net that pulls the wizard right back from the grave whenever it hits the dirt. To trigger that return, you feed Naru Meha to Yahenni, Undying Partisan's sacrifice ability, which conveniently grants Yahenni indestructible to weather the storm while growing fat on a mountain of +1/+1 counters and infinite death triggers.