How can you create a combo with Mechanized Production, Ugin's Nexus, Teferi's Realm?
user
[START OF COMBO]This combo can be formed with Mechanized Production, Ugin's Nexus, Teferi's Realm

Color identity: U
Mana cost: 
Steps:
  1. At the beginning of your upkeep, Mechanized Production and Teferi's Realm trigger.
  2. Resolve the Mechanized Production trigger, creating a token copy of Ugin's Nexus.
  3. Put the token copy of Ugin's Nexus into exile due to the legend rule, causing you to take an extra turn after this one.
  4. Resolve the Teferi's Realm trigger, causing Ugin's Nexus and Mechanized Production to phase out.
  5. Move to your next turn.
  6. At the beginning of your untap step, Mechanized Production and Ugin's Nexus phase in.
  7. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Mechanized Production attached to Ugin's Nexus.
[END OF COMBO PREREQUISITES]
assistant