Diligent Excavator + Mercurial Pretender + Thassa's Oracle + Underworld Breach

Mana needed: {U}{U}

UR identity

Commander legal

The 4 combo pieces

What must be in place

Mercurial Pretender is a copy of Diligent Excavator.

How to execute it

  1. Cast the artifact creature from your hand by paying {0}.
  2. Diligent Excavator and Mercurial Pretender trigger, causing you to mill four cards.
  3. The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
  4. Cast the artifact creature from your graveyard for its escape cost by paying {0} and exiling any three cards from your graveyard, except Thassa's Oracle if it is in your graveyard.
  5. Repeat from step 2 until you have an empty library.
  6. If Thassa's Oracle is in your hand, cast it by paying {U}{U}.
  7. Otherwise, cast Thassa's Oracle from your graveyard for its escape cost by paying {U}{U} and exiling three cards from your graveyard.
  8. Thassa's Oracle enters the battlefield, causing you to win the game.

What the combo produces