Cast Entering by paying its mana cost, targeting any applicable target.
Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, targeting Entering.
Holding priority, activate Shilgengar by sacrificing Naru Meha.
Resolve the Naru Meha trigger, copying Entering, with the copy targeting Naru Meha
Resolve the Entering copy, returning Naru Meha from your graveyard to the battlefield.
Repeat from step 3.
This clever loop relies on Naru Meha, Master Wizard entering the battlefield with flash to perpetually copy and recur Entering. By utilizing Shilgengar, Sire of Famine to sacrifice Naru Meha for Blood tokens along the way, you fuel an endless cycle of enters-the-battlefield and leaves-the-battlefield triggers. Breaking // Entering handles the heavy lifting of pulling Naru Meha right back out of the graveyard every single iteration, turning a single sorcery and a legendary duo into an infinite engine for tokens, sacrifices, and magecraft.