Aggravated Assault + Shadow of the Second Sun

UR identity

Commander legal

The 2 combo pieces

What must be in place

Lands you control can tap to produce at least {6}{R}{R}{R}{R}.

How to execute it

  1. Move to your postcombat main phase.
  2. Shadow of the Second Sun triggers, causing you to get an additional beginning phase after this phase.
  3. Activate all lands you control by tapping them, adding at least {6}{R}{R}{R}{R}.
  4. Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
  5. Repeat step 4 one additonal time.
  6. Move to the main phase from step 5.
  7. At the beginning of the main phase, Shadow of the Second Sun triggers, causing you to get an additional beginning phase after this phase.
  8. Move to the beginning phase from step 7, causing you to untap all lands you control and draw a card.
  9. Move to the main phase from step 4.
  10. Repeat from step 2.

What the combo produces