Dour Port-Mage + Eternal Witness + Time Walk

GU identity

The 3 combo pieces

What must be in place

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

How to execute it

  1. Cast Time Walk 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 Time Walk 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