Naru Meha, Master Wizard + Second Sunrise + Yahenni, Undying Partisan

Naru Meha, Master Wizard

Second Sunrise

Yahenni, Undying Partisan

How it works

1. Cast Second Sunrise by paying its mana cost
2. Holding priority, cast Naru Meha by paying its mana cost.
3. When Naru Meha enters, it triggers, targeting Second Sunrise.
4. Holding priority, activate Yahenni by sacrificing Naru Meha.
5. Resolve the Naru Meha trigger, copying Second Sunrise
6. Resolve the Second Sunrise copy, returning Naru Meha from your graveyard to the battlefield.
7. Repeat from step 3.

This clever loop hinges on the clever interplay between Naru Meha, Master Wizard and Second Sunrise to endlessly recycle your board state. By having Yahenni, Undying Partisan sacrifice Naru Meha in response to its own enter-the-battlefield trigger, you set up a situation where the copied Second Sunrise brings Naru Meha right back to the battlefield to do it all over again. While Yahenni's sacrifice ability and pump effects give the combo its necessary loop mechanism and a massive threat, Naru Meha and Second Sunrise do the heavy lifting of duplicating the spell to endlessly repeat the cycle.