Mary Read and Anne Bonny, Gilded Assault Cart, Xorn, and Prognostic Sphinx

Prerequisites

• Mary Read and Anne Bonny on the battlefield
• Gilded Assault Cart in hand
• Xorn on the battlefield
• Prognostic Sphinx on the battlefield

Steps

1. Activate Prognostic Sphinx by discarding Gilded Assault Cart
2. Mary Read and Anne Bonny triggers, creating two tapped Treasure tokens
3. Resolve the Prognostic Sphinx ability
4. Activate Gilded Assault Cart by sacrificing two Treasures, returning Gilded Assault Cart from your graveyard to your hand
5. Repeat

Results

• Infinite self-discard triggers