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