Activate Ashnod's Altar by sacrificing Marionette Apprentice, adding CC.
When Marionette Apprentice dies, Nim Deathmantle triggers, causing you to pay 4 to return Marionette Apprentice from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Marionette Apprentice enters, it triggers, creating a creature token.
Activate Ashnod's Altar by sacrificing a creature token, adding CC.
When the creature token dies, Marionette Apprentice triggers, causing each opponent to lose 1 life.
Repeat.
This clever loop turns the classic sacrifice engine into a lethal device by leveraging multiple interlocking triggers. You begin by using Ashnod's Altar to sacrifice Marionette Apprentice, generating two colorless mana and triggering Nim Deathmantle to offer a resurrection for four mana. Thanks to Marionette Apprentice's fabricate ability, its return to the battlefield creates a fresh creature token that you can immediately feed back into Ashnod's Altar for more mana. Finally, Marionette Apprentice's drain ability watches every single artifact and creature die—including itself and the sacrificed token—turning this endless cycle of recycling into infinite life loss for your opponents.