How can you create a combo with Phyrexian Altar, Geth's Summons, Archaeomancer?
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[START OF COMBO]This combo can be formed with Phyrexian Altar, Geth's Summons, Archaeomancer

Color identity: UB
Mana cost: {2}{B}{B}
Steps:
  1. Cast Geth's Summons by paying {2}{B}{B}, returning Archaeomancer from your graveyard and three creatures from opponents' graveyards to the battlefield under your control.
  2. Archaeomancer triggers, returning Geth's Summons from your graveyard to your hand.
  3. Activate Phyrexian Altar four times by sacrificing all four creatures you returned in step 1, adding {2}{B}{B}.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite blinking of creatures in opponent's graveyards
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Phyrexian Altar must be on the battlefield
  - Geth's Summons must be in your hand
  - Archaeomancer must be in the graveyard
  - At least three opponents have at least three poison counters each and at least one creature card each in their graveyards.
[END OF COMBO PREREQUISITES]
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