How can you create a combo with Prototype Portal, Dross Scorpion, Phyrexian Altar, Myr Moonvessel?
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[START OF COMBO]This combo can be formed with Prototype Portal, Dross Scorpion, Phyrexian Altar, Myr Moonvessel

Color identity: C
Mana cost: {1}
Steps:
  1. Activate Prototype Portal for {1}, creating a token copy of Myr Moonvessel.
  2. Activate Phyrexian Altar by sacrificing Myr Moonvessel, adding one many of any color.
  3. Myr Moonvessel and Dross Scorpion trigger.
  4. Resolve the Myr Moonvessel trigger, adding {C}.
  5. Resolve the Dross Scorpion, untapping Prototype Portal.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Dross Scorpion must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Myr Moonvessel must be exiled
[END OF COMBO PREREQUISITES]
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