Meticulous Excavation + Phyrexian Altar Combos

3 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite colored mana Infinite sacrifice triggers Infinite death triggers

Combo 1 with Infinite Guideline Station

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite tapped creature tokens
Steps
  1. Cast Infinite Guideline Station either from your hand or from the command zone by paying {W}{U}{B}{R}{G} plus commander tax, if applicable.
  2. When Infinite Guideline Station enters the battlefield, it triggers, creating a tapped 2/2 Robot artifact creature token for each multicolored permanent you control.
  3. Activate Phyrexian Altar eight times by sacrificing eight Robots, adding {2}{W}{W}{U}{B}{R}{G}.
  4. Activate Meticulous Excavation by paying {2}{W}, returning Infinite Guideline Station from the battlefield to your hand.
  5. Repeat.

Combo 2 with Toph, the First Metalbender + Ugin's Nexus

Results: Infinite turns · Lock
Show steps
  1. Cast Ugin's Nexus by paying {5}.
  2. At the beginning of your end step, Toph triggers, causing Ugin's Nexus to become an artifact land creature.
  3. Activate Phyrexian Altar by sacrificing Ugin's Nexus, adding {W}. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  4. Toph triggers, returning Ugin's Nexus from exile to the battlefield.
  5. Activate Meticulous Excavation by paying {2}{W}, returning Ugin's Nexus from the battlefield to your hand.
  6. Repeat each turn.

Combo 3 with Ojer Taq, Deepest Foundation // Temple of Civilization + Triceraton Commander + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Results: Infinite ETB · Infinite LTB · Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Triceraton Commander by paying {4}{W}{W} minus {1} or {W} for each creature you can tap to help cast it due to its convoke ability.
  2. When Triceraton Commander enters, it triggers, creating six 2/2 Dinosaur Soldier creature tokens due to Ojer Taq.
  3. Activate Meticulous Excavation by paying {2}{W}, returning Triceraton Commander from the battlefield to your hand.
  4. Cast Triceraton Commander by paying {0} and tapping six Dinosaur Soldiers due to its convoke ability.
  5. When Triceraton Commander enters, it triggers, creating six 2/2 Dinosaur Soldier creature tokens due to Ojer Taq.
  6. Activate Phyrexian Altar three times by sacrificing three Dinosaur Soldiers, adding {2}{W}.
  7. Repeat from step 3.
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