Ghouls' Night Out + Phyrexian Altar + Blessed Sanctuary + Eternal Witness

Ghouls' Night Out

Phyrexian Altar

Blessed Sanctuary

Eternal Witness

How it works

1. Cast Ghouls' Night Out by paying 3, 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.
2. When Eternal Witness and the creatures enter the battlefield, Blessed Sanctuary triggers once for each creature, and Eternal Witness triggers once.
3. Resolve the Eternal Witness trigger, returning Ghouls' Night Out from your graveyard to your hand.
4. Resolve all Blessed Sanctuary triggers, creating that many 2/2 Unicorn creature tokens.
5. Activate Phyrexian Altar five times by sacrificing Eternal Witness, two creatures your opponents own, and two Unicorns, adding 3.
6. Repeat.

This loop transforms graveyard recursion into an infinite engine by leveraging Ghouls' Night Out to pull Eternal Witness and opponent threats directly onto the battlefield. Blessed Sanctuary acts as the crucial passive enabler here, protecting your creatures from the self-sacrifice downside of *decayed* while turning every single creature entry—including Eternal Witness and the resulting token swarm—into a fresh 2/2 white Unicorn. Once everything is in play, Phyrexian Altar provides the necessary sacrifice outlet to feed those creatures into colored mana, letting you recast Ghouls' Night Out over and over to repeat the entire cycle indefinitely.