Naru Meha, Master Wizard + Faith's Reward + Yahenni, Undying Partisan

Naru Meha, Master Wizard

Faith's Reward

Yahenni, Undying Partisan

How it works

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

By chaining Faith's Reward to return your sacrificed permanents, this loop relies on Naru Meha, Master Wizard entering the battlefield repeatedly to copy the spell over and over. Since Naru Meha keeps heading to the graveyard only to be brought right back, Yahenni, Undying Partisan provides the vital sacrifice outlet to send her there on demand while reaping the benefits of endless death and sacrifice triggers.