Ambassador Laquatus + Underworld Breach Combos

3 known combos featuring both cards in Commander

Infinite self-mill

Combo 1 with Lion's Eye Diamond

Also requires: Lion's Eye Diamond Lion's Eye Diamond
Results: Infinite self-mill
Steps
  1. Sacrifice Lion's Eye Diamond producing {3}.
  2. Activate Ambassador Laquatus's ability for 3 milling 3 cards.
  3. Cast Lion's Eye Diamond for its escape cost with Underworld Breach, exiling the 3 cards milled by Laquatus.
  4. Repeat the cycle until you've milled yourself out.

Combo 2 with Cabal Ritual

Also requires: Cabal Ritual Cabal Ritual
Results: Infinite self-mill
Show steps
  1. Cast Cabal Ritual from your graveyard for its escape cost by paying {1}{B} and exiling three other cards from your graveyard, adding {B}{B}{B}{B}{B}.
  2. Activate Ambassador Laquatus by paying {3}, causing you to mill three cards.
  3. Repeat.

Combo 3 with Brightstone Ritual

Also requires: Brightstone Ritual Brightstone Ritual
Results: Infinite self-mill
Show steps
  1. Cast Brightstone Ritual from your graveyard for its escape cost by paying {R} and exiling three other cards from your graveyard, adding at least {R}{R}{R}{R}.
  2. Activate Ambassador Laquatus by paying {3}, causing you to mill three cards.
  3. Repeat.
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