Dour Port-Mage + Eternal Witness + Walk the Aeons

GU identity

Commander legal

The 3 combo pieces

What must be in place

{1}{U} available plus enough mana to cast Walk the Aeons and Eternal Witness each turn.

How to execute it

  1. Cast Walk the Aeons by paying its mana cost, causing you to take an extra turn after this one.
  2. Cast Eternal Witness by paying its mana cost.
  3. When Eternal Witness enters the battlefield, it triggers, returning Walk the Aeons from your graveyard to your hand.
  4. Move to your next turn.
  5. Activate Dour Port-Mage by paying {1}{U} and tapping it, returning Eternal Witness from the battlefield to your hand.
  6. Dour Port-Mage triggers, causing you to draw a card.
  7. Repeat.

What the combo produces