Ghouls' Night Out by paying ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) , returning
Eternal Witness from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
When
Eternal Witness and the creatures enter the battlefield,
Blessed Sanctuary triggers once for each creature, and
Eternal Witness triggers once.
Resolve the
Eternal Witness trigger, returning
Ghouls' Night Out from your graveyard to your hand.
Resolve all
Blessed Sanctuary triggers, creating that many 2/2 Unicorn creature tokens.
Activate
Phyrexian Altar five times by sacrificing
Eternal Witness, two creatures your opponents own, and two Unicorns, adding ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) .