Recurring Nightmare and Phyrexian Altar on the battlefield.
You control at least one creature.
Steps
Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Deranged Hermit from your graveyard to the battlefield.
When Deranged Hermit enters the battlefield, it triggers, creating four 1/1 Squirrel creature tokens.
Activate Phyrexian Altar three times by sacrificing Deranged Hermit and two Squirrels, adding ({2} magic symbol) ({B} magic symbol) .