Cost Not Dead After All by paying , targeting a creature you control.
Holding priority, cast Naru Meha by paying 2.
When Naru Meha enters the battlefield, it triggers, copying Not Dead After All, with the copy targeting Naru Meha
Resolve the copy of Not Dead After All.
Holding priority, activate Yahenni by sacrificing Naru Meha.
When Naru Meha dies, it triggers, returning itself from your graveyard to the battlefield with a Wicked Role token attached to it.
When Naru Meha enters the battlefield, it triggers, copying Not Dead After All, with the copy targeting Naru Meha.
Resolve the copy of Not Dead After All.
Resolve the Yahenni ability.
Activate Yahenni by sacrificing Naru Meha.
When Naru Meha dies, it and the Wicked Role token attached to it trigger.
Resolve the Wicked Role trigger, causing each opponent to lose 1 life.
Resolve the Naru Meha trigger, returning it from your graveyard to the battlefield with a Wicked Role token attached to it.
Repeat from step 7.
This clever loop leverages the recursive protection of Not Dead After All to continuously recast and sacrifice Naru Meha, Master Wizard. By targeting Naru Meha with the spell's delayed return effect and sacrificing her to Yahenni, Undying Partisan's ability before the original spell even resolves, you ensure that Naru Meha's entry trigger perpetually copies the spell right back onto herself. As she bounces back and forth with a Wicked Role token attached, the cycle naturally fuels infinite death triggers, sacrifice triggers, and life loss for your opponents.