Holding priority, cast Naru Meha by paying its mana cost.
When Naru Meha enters, it triggers, copying Demonic Gifts, with the copy targeting Naru Meha.
Resolve the copy of Demonic Gifts.
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 clever loop begins by leveraging Demonic Gifts to grant Naru Meha, Master Wizard a built-in resurrection trigger right as she enters the battlefield to copy that very spell. With Naru Meha targeted by her own duplicated enchantment, you can safely feed her to Shilgengar, Sire of Famine's sacrifice ability; Shilgengar readily processes the creature into a fresh Blood token while triggering Demonic Gifts to bring Naru Meha straight back to the battlefield. Because Naru Meha immediately re-triggers upon her return to copy Demonic Gifts anew, you can repeat this cycle infinitely to amass an endless supply of Blood tokens and death triggers.