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