Cast Ghouls' Night Out by paying ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) , returning Archaeomancer from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
When Archaeomancer enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
Activate Phyrexian Altar three times by sacrificing Archaeomancer and the two creatures your opponents own, adding ({1} magic symbol) ({B} magic symbol) ({B} magic symbol) .
When the three creatures die, Headless Rider triggers three times, creating three 2/2 Zombie creature tokens.
Activate Phyrexian Altar twice by sacrificing two Zombies, adding ({2} magic symbol) .