Hellkite Charger, Sword of Feast and Famine, and Horizon Stone

Prerequisites

• All permanents on the battlefield
• Sword of Feast and Famine attached to Hellkite Charger
• You control land sources that can tap for
• Opponents can not block Hellkite Charger

Steps

1. Attack with Hellkite Charger
2. Hellkite Charger triggers
3. Tap all lands you control
4. Pay to the Hellkite Charger trigger, gaining an extra combat phase and untapping all attacking creatures you control
5. When Hellkite Charger deals combat damage, untap all lands you control and the defending player discards a card
6. Move to your combat phase
7. Your remaining mana becomes colorless
8. Repeat

Results

• Infinite combat phases
• Your opponents discard their hands
• Infinite colorless mana
• Infinite damage