How can you create a combo with Emry, Lurker of the Loch, Ugin's Nexus, Isochron Scepter, Pull from Eternity, Arcbound Ravager?
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[START OF COMBO]This combo can be formed with Emry, Lurker of the Loch, Ugin's Nexus, Isochron Scepter, Pull from Eternity, Arcbound Ravager

Color identity: WU
Mana cost: {7} each extra turn
Steps:
  1. Activate Arcbound Ravager by sacrificing Ugin's Nexus, putting a +1/+1 counter on it.
  2. When Ugin's Nexus is sacrificed, it is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  3. Move to your next turn.
  4. Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
  5. Resolve Pull from Eternity, putting Ugin's Nexus from exile into your graveyard.
  6. Activate Emry by tapping it, targeting Ugin's Nexus.
  7. Cast Ugin's Nexus from your graveyard by paying {5}.
  8. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Emry, Lurker of the Loch must be on the battlefield
  - Ugin's Nexus must be on the battlefield
  - Isochron Scepter must be on the battlefield
  - Pull from Eternity must be exiled
  - Arcbound Ravager must be on the battlefield
[END OF COMBO PREREQUISITES]
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