Reincarnation + Naru Meha, Master Wizard + Yahenni, Undying Partisan

Reincarnation

Naru Meha, Master Wizard

Yahenni, Undying Partisan

How it works

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

This clever loop turns Naru Meha, Master Wizard into a self-replicating engine by using her own entering-the-battlefield trigger to copy Reincarnation, targeting Naru Meha herself. Once the copy resolves, you can instantly sacrifice Naru Meha to Yahenni, Undying Partisan, whose sacrifice ability conveniently provides a way to trigger Reincarnation's deferred return effect. When Naru Meha dies, Reincarnation brings her right back to the battlefield, restarting the cycle while feeding Yahenni a steady stream of death triggers and +1/+1 counters.