Hellkite Charger + Sword of Feast and Famine

Hellkite Charger
Sword of Feast and Famine

Requires
All permanents on the battlefield. Sword of Feast and Famine attached to Hellkite Charger. You control lands that can produce at least 5rr. Opponents cannot block Hellkite Charger.
Steps
  1. Declare Hellkite Charger as an attacker
  2. Hellkite Charger triggers
  3. In response, activate lands you control by tapping them, adding at least 5rr
  4. Resolve Hellkite Charger's trigger, paying 5rr to gain an extra combat phase and untap all attacking creatures you control
  5. When Hellkite Charger deals combat damage, Sword of Feast and Famine triggers, untapping all lands you control and causing the defending player to discard a card
  6. Repeat
Results
Infinite combat phases. Your opponents discard their hands. Infinite damage. Infinite combat damage. Infinite untap of lands you control.