How can you create a combo with Prototype Portal, Dross Scorpion, March of the Machines, Treasure Vault?
user
[START OF COMBO]This combo can be formed with Prototype Portal, Dross Scorpion, March of the Machines, Treasure Vault

Color identity: U
Mana cost: 
Steps:
  1. Activate Prototype Portal by paying {0} and tapping it, creating a token copy of Treasure Vault.
  2. The Treasure Vault token enters the battlefield as a 0/0 creature due to March of the Machines, and dies as a state-based action due to having zero or less toughness.
  3. Dross Scorpion triggers, untapping Prototype Portal.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite landfall triggers
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Dross Scorpion must be on the battlefield
  - March of the Machines must be on the battlefield
  - Treasure Vault must be exiled
[END OF COMBO PREREQUISITES]
assistant