The Serpent Society, Glissa, the Traitor, Phyrexian Altar, and Hullcarver

Prerequisites

• The Serpent Society on the battlefield
• Glissa, the Traitor on the battlefield
• Phyrexian Altar on the battlefield
• Hullcarver on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Hullcarver, adding
2. When Hullcarver dies, The Serpent Society triggers, causing each opponent to sacrifice a nontoken creature they control
3. When a creature dies this way, Glissa triggers, returning Hullcarver from your graveyard to your hand
4. Cast Hullcarver by paying
5. Repeat as able

Results

• Each opponent sacrifices all nontoken creatures they control during each of your turns