Feldon of the Third Path, Thornbite Staff, Cathodion, and Thermopod

Prerequisites

• Feldon of the Third Path on the battlefield
• Thornbite Staff on the battlefield
• Cathodion in the graveyard
• Thermopod on the battlefield
• available

Steps

1. Activate Feldon of the Third Path by paying and tapping it, creating a token copy of Cathodion with haste
2. Activate Thermopod's second ability by sacrificing the Cathodion token, adding
3. When the Cathodion token dies, it and Feldon of the Third Path trigger
4. Resolve the Feldon of the Third Path trigger, untapping it
5. Resolve the Cathodion trigger, adding
6. Repeat

Results

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