Phyrexian Altar + Port Razer Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite combat phases

Combo 1 with Luxurious Locomotive + Ruthless Technomancer

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite combat phases · Infinite untap of creatures you control · Infinite mana creatures you control can produce · Infinite Treasure tokens · Return all creature cards from your graveyard to the battlefield
Steps
  1. Activate Luxurious Locomotive's crew ability by tapping six creatures you control with total power 1 or greater, causing Luxurious Locomotive to become an artifact creature until end of turn.
  2. Declare Luxurious Locomotive and Port Raazer as attackers, triggering Luxurious Locomotive, creating at least six Treasure tokens.
  3. Deal combat damage using Port Razer, triggering its ability.
  4. Holding priority, activate Phyrexian Altar by sacrificing Port Razer, adding {1}.
  5. Resolve the Port Razer ability, untapping all creatures you control and causing you to get an additional combat phase after this one.
  6. Activate two Treasures by tapping and sacrificing them, adding {1}{B}.
  7. Activate Ruthless Technomancer by paying {2}{B} and sacrificing four Treasures, returning Port Razer from your graveyard to the battlefield.
  8. Repeat from step 2 each combat phase.

Combo 2 with Yore-Tiller Nephilim

Also requires: Yore-Tiller Nephilim Yore-Tiller Nephilim
Results: Infinite combat damage · Infinite combat phases · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mana creatures you control can produce · Infinite sacrifice triggers · Infinite untap of creatures you control
Show steps
  1. Declare Yore-Tiller Nephilim as an attacker.
  2. Yore-Tiller Nephilim triggers, returning Port Razer from your graveyard onto the battlefield tapped and attacking.
  3. Deal combat damage with Port Razer and Yore-Tiller Nephilim.
  4. Port Razer triggers, untapping each creature you control and causing you to get an additional combat phase after this one.
  5. Activate Phyrexian Altar by sacrificing Port Razer, adding one mana of any color.
  6. Repeat each combat phase.
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