Feldon of the Third Path, Priest of Urabrask, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Feldon of the Third Path on the battlefield
• Priest of Urabrask in the graveyard
• Thornbite Staff on the battlefield
• Ashnod's Altar 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 Ashnod's Altar by sacrificing Priest of Urabrask, adding
4. When Priest of Urabrask dies, Feldon triggers, untapping Feldon
5. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite sacrifice triggers