How can you create a combo with Prototype Portal, Ugin's Nexus, Megatog?
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[START OF COMBO]This combo can be formed with Prototype Portal, Ugin's Nexus, Megatog

Color identity: R
Mana cost: {5} each turn
Steps:
  1. Activate Prototype Portal by paying {5} and tapping it, creating a token copy of Ugin's Nexus.
  2. Activate Megatog by sacrificing the Ugin's Nexus token.
  3. The Ugin's Nexus token is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  4. Resolve the Megatog ability, giving it +3/+3 until end of turn.
  5. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Ugin's Nexus must be exiled
  - Megatog must be on the battlefield
[END OF COMBO PREREQUISITES]
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