You control at least two additional nontoken creatures.
Steps
Activate Ashnod's Altar by sacrificing Gerrard and any two other nontoken creatures, adding six ({C} magic symbol) .
Nim Deathmantle and Gerrard trigger.
Resolve the Nim Deathmantle trigger, causing you to pay ({4} magic symbol) to return Gerrard from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Resolve the Gerrard trigger, returning all artifact and creature cards that were put into your graveyard this turn from your graveyard onto the battlefield.