Activate Ashnod's Altar by sacrificing Dread Drone, adding CC.
When Dread Drone dies, Nim Deathmantle triggers, causing you to pay 4 to return Dread Drone from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Dread Drone enters, it triggers, creating two creature tokens.
Activate Ashnod's Altar by sacrificing a creature token, adding CC.