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