Sword of Feast and Famine + Aggravated Assault

Sword of Feast and Famine
Aggravated Assault

Requires
All permanents on the battlefield. Sword of Feast and Famine attached to a creature that can attack this turn. An opponent is unable to block and kill the creature with Sword of Feast and Famine attached. Lands you control can tap to produce at least 3rr.
Steps
  1. Deal combat damage to an opponent with the creature that has Sword of Feast and Famine attached
  2. Sword of Feast and Famine triggers, causing that opponent to discard a card, and you to untap all lands you control
  3. Proceed to your postcombat main phase
  4. Activate all mana producing lands you control by tapping them, adding at least 3rr
  5. Activate Aggravated Assault by paying 3rr, untapping all creatures you control and causing you to get an additional combat and main phase after this phase
  6. Repeat
Results
Infinite combat phases.