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