How can you create a combo with Encroaching Mycosynth, Archaeomancer, Scrap Mastery, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Encroaching Mycosynth, Archaeomancer, Scrap Mastery, Phyrexian Altar

Color identity: UR
Mana cost: {3}{R}{R}
Steps:
  1. Cast Scrap Mastery by paying {3}{R}{R}, swapping all nonland permanents you control for all nonland permanents in your graveyard.
  2. Archaeomancer enters the battlefield, returning Scrap Mastery from your graveyard to your hand.
  3. Activate Phyrexian Altar five times by sacrificing Archaeomancer and four other creatures, adding {R}{R}{R}{R}{R}.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Encroaching Mycosynth must be on the battlefield
  - Archaeomancer must be in the graveyard
  - Scrap Mastery must be in your hand
  - Phyrexian Altar must be on the battlefield
  - At least four additional creatures in graveyard and/or on the battlefield.
[END OF COMBO PREREQUISITES]
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