How can you create a combo with Karn, the Great Creator, Ugin's Nexus, Throne of Geth, The Chain Veil?
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[START OF COMBO]This combo can be formed with Karn, the Great Creator, Ugin's Nexus, Throne of Geth, The Chain Veil

Color identity: C
Mana cost: {4} on your first turn, with {9} available each extra turn
Steps:
  1. Activate The Chain Veil by paying {4} and tapping it, allowing an extra activation of your planeswalkers' abilities this turn.
  2. Activate Throne of Geth by tapping it and sacrificing Ugin's Nexus.
  3. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
  4. Resolve the Throne of Geth ability, putting a loyalty counter on Karn.
  5. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing a noncreature artifact to become an artifact creature until end of turn.
  6. Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
  7. Move to your next turn.
  8. Cast Ugin's Nexus by paying {5}.
  9. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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