Phyrexian Altar + Sengir, the Dark Baron Combos

2 known combos featuring both cards in Commander

Infinite +1/+1 counters on a creature Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Animation Module

Also requires: Animation Module Animation Module
Results: Infinite +1/+1 counters on a creature · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Phyrexian Altar by sacrificing any other creature you control, adding {1}.
  2. The creature dies, triggering Sengir, putting two +1/+1 counters on itself.
  3. Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  4. Repeat.

Combo 2 with Ghave, Guru of Spores

Results: Infinite +1/+1 counters on a creature · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Ghave's first ability by paying {1} and removing a +1/+1 counter from Sengir, creating a 1/1 Saproling creature token.
  2. Activate Phyrexian Altar by sacrificing the Saproling, adding {1}.
  3. The Saproling dies, triggering Sengir's first ability, putting two +1/+1 counters on Sengir.
  4. Repeat.
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