Athreos, God of Passage is an Orzhov Cleric aristocrats deck built around sacrificing creatures, draining life, and forcing opponents into difficult choices with Athreos triggers.

The deck wants to:

• flood the board with Clerics,
• sacrifice creatures for value,
• recur them repeatedly,
• and slowly drain opponents out.

Key synergies:

• Athreos + sacrifice outlets
  Cards like Vampiric Rites, Priest of Forgotten Gods, Whisper, Blood Liturgist, and Skirsdag Flayer let you sacrifice creatures repeatedly while Athreos pressures opponents to either lose life or give the creatures back.
• Drain effects
  Zulaport Cutthroat, Cruel Celebrant, Marauding Blight-Priest, and Bastion of Remembrance punish opponents whenever your creatures die.
• Cleric tribal payoffs
  Orah, Skyclave Hierophant, Taborax, Hope’s Demise, and Doubtless One reward you for constantly recycling Clerics.
• Recursion package
  Teshar, Ancestor’s Apostle, Bishop of Rebirth, Doomed Necromancer, and Nullpriest of Oblivion help rebuild your board after wipes.
• Lifegain synergy
  Soul Warden, Suture Priest, Kor Celebrant, and Attended Healer generate steady life gain while supporting your drain plan.

The deck wins through repeated sacrifice loops, life drain, and recursive value until opponents are slowly overwhelmed.