Cast Megaton's Fate by paying 5, targeting the indestructible artifact.
Holding priority, activate Emiel the Blessed by paying 3, blinking Naru Meha.
When Naru Meha enters the battlefield, it triggers, copying Megaton's Fate, with the copy targeting the indestructible artifact.
Resolve the copy of Megaton's Fate, failing to destroy the artifact due to it being indestructible, and creating four Treasure tokens.
Activate three Treasure tokens by tapping and sacrificing them, adding 3.
Repeat from step 2.
This clever loop relies on Naru Meha, Master Wizard exploiting the spell-copying ability she brings upon entering the battlefield. By casting Megaton's Fate and choosing its Disarm mode to target an indestructible artifact, you can safely trigger infinite spell copies without the target ever being destroyed. Whenever Emiel the Blessed blinks Naru Meha back into play, the wizard's entrance creates a fresh copy of Megaton's Fate that yields four Treasure tokens. Sacrificing those very Treasures then feeds right back into the mana required to activate Emiel the Blessed once more, sustaining the infinite cycle.