Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, copying Undying Malice, with the copy targeting Naru Meha.
Resolve the copy of Undying Malice.
Holding priority, activate Shilgengar by sacrificing Naru Meha.
When Naru Meha dies, it triggers, returning it from your graveyard to the battlefield.
Repeat from step 3.
Resolve all Shilgengar abilities from step 5.
This intricate loop turns a simple combat trick into an engine of endless resurrection. By targeting Naru Meha, Master Wizard with the copy of Undying Malice she generates upon entering the battlefield, you set up a self-sustaining cycle where sacrificing Naru Meha to Shilgengar, Sire of Famine triggers her immediate return from the graveyard. Shilgengar happily feeds on these sacrifices to generate an endless stream of Blood tokens alongside a mountain of enter-the-battlefield, death, and magecraft triggers, leaving your opponents utterly buried in the wake of the Sire of Famine's eternal hunger.