Cast Corpse Dance 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 Corpse Dance.
Holding priority, activate Shilgengar by sacrificing Naru Meha.
Resolve the Naru Meha trigger, copying Corpse Dance, with the copy targeting Naru Meha
Resolve the Corpse Dance copy, returning Naru Meha from your graveyard to the battlefield.
Repeat from step 3.
This loop begins by leveraging Corpse Dance to pull a creature from your graveyard, holding priority to drop Naru Meha, Master Wizard into play so its entering trigger targets the original spell. From there, sacrificing Naru Meha to Shilgengar, Sire of Famine provides a Blood token while setting up a recurring engine, since the copied Corpse Dance targets Naru Meha in the graveyard to bring it right back. Because Shilgengar's sacrifice ability triggers endlessly and Naru Meha continuously copies the spell to recur itself, you generate infinite death triggers, enter-the-battlefield triggers, and a massive hoard of Blood tokens.