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 1.
Repeat from step 2.
This cunning loop turns the Disarm mode of Megaton's Fate into an absolute treasure trove by leveraging the blink ability of Lilysplash Mentor. Because your target artifact is indestructible, Megaton's Fate refuses to break it—yet it still dutifully grants you four shiny Treasure tokens every single time. You then sacrifice three of those Treasures for the mana needed to fuel Lilysplash Mentor's activation, blinking Naru Meha, Master Wizard. When Naru Meha, Master Wizard re-enters the battlefield, its triggered ability steps in to copy the original Megaton's Fate on the stack, perpetuating the cycle for infinite mana, tokens, and spell copies!