Activate Ashnod's Altar twice by sacrificing Phylath and an additional creature, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Nim Deathmantle triggers, causing you to pay ({4} magic symbol) to return Phylath from your graveyard to the battlefield and attaching Nim Deathmantle to it.
Phylath enters the battlefield triggering, creating at least two 0/1 Plant creature tokens.