Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, targeting Faith's Reward.
Holding priority, activate Shilgengar by sacrificing Naru Meha.
Resolve the Naru Meha trigger, copying Faith's Reward
Resolve the Faith's Reward 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 to copy Faith's Reward, which in turn returns Naru Meha right back from your graveyard after you sacrifice it. To fuel the engine, Shilgengar, Sire of Famine provides the necessary sacrifice outlet, turning Naru Meha's demise into a steady supply of Blood tokens. By repeatedly looping this process, you generate an endless stream of artifact tokens, creature triggers, and sacrifices to overwhelm your opponents.