Phyrexian Metamorph + Abuelo's Awakening + Naru Meha, Master Wizard

Phyrexian Metamorph

Abuelo's Awakening

Naru Meha, Master Wizard

How it works

1. Cast Abuelo's Awakening by paying 3, targeting Phyrexian Metamorph.
2. Holding priority, cast Naru Meha by paying 2.
3. When Naru Meha enters the battlefield, it triggers, copying Abuelo's Awakening, targeting Phyrexian Metamorph.
4. Resolve the copy of Abuelo's Awakening, returning Phyrexian Metamorph from your graveyard to the battlefield as a copy of Naru Meha.
5. Put Phyrexian Metamorph into your graveyard due to the legend rule.
6. Phyrexian Metamorph's enters-the-battlefield ability triggers, copying Abuelo's Awakening, targeting Phyrexian Metamorph.
7. Repeat from step 4.

This elegant recursive loop begins by casting Abuelo's Awakening to target Phyrexian Metamorph in your graveyard, setting up a resurrection that transforms it into a flying Spirit. By holding priority and casting Naru Meha, Master Wizard into the mix, you immediately gain a trigger upon its entry to copy that original spell. When the copied Abuelo's Awakening resolves and drags the Metamorph back, you have it enter as a fresh copy of Naru Meha, Master Wizard; the resulting legend rule sends it right back to the graveyard while its own newly acquired entrance trigger continues the chain. Because Naru Meha, Master Wizard is a Wizard, its static lord buff is neatly bypassed by the pure mechanical engine, leaving the rest of your board safe as you generate an endless succession of creature entries, leaves, and death triggers.