Feldon of the Third Path, Priest of Urabrask, Thornbite Staff, and Altar of Dementia

Prerequisites

• Feldon of the Third Path on the battlefield
• Priest of Urabrask in the graveyard
• Thornbite Staff on the battlefield
• Altar of Dementia on the battlefield
• Thornbite Staff attached to Feldon
• Feldon does not have summoning sickness
• available

Steps

1. Activate Feldon by paying and tapping it, creating a token copy of Priest of Urabrask that is an artifact in addition to its other types
2. When Priest of Urabrask enters the battlefield, it triggers, adding
3. Activate Altar of Dementia by sacrificing Priest of Urabrask
4. When Priest of Urabrask dies, Feldon triggers, untapping Feldon
5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Urabrask' power
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill