How can you create a combo with River Song, Kylox's Voltstrider, Time Stretch?
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[START OF COMBO]This combo can be formed with River Song, Kylox's Voltstrider, Time Stretch

Color identity: UR
Mana cost: {8}{U}{U} each other turn
Steps:
  1. Cast Time Stretch by paying {8}{U}{U}, causing you to take two extra turns after this one.
  2. Move to your second extra turn.
  3. Activate Kylox's Voltstrider's first ability by exiling Time Stretch from your graveyard, causing Kylox's Voltstrider to become an artifact creature until end of turn.
  4. Declare Kylov's Voltstrider as an attacker.
  5. Kylox's Voltstrider triggers, causing you to pay {8}{U}{U} to cast Time Stretch from exile.
  6. Resolve Time Stretch, causing you to take two extra turns after this one, and put Time Stretch on the bottom of your library.
  7. Move to your first extra turn, drawing Time Stretch from the bottom of your library due to River Song.
  8. Move to your second extra turn.
  9. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - River Song must be on the battlefield
  - Kylox's Voltstrider must be on the battlefield
  - Time Stretch must be in your hand
  - An opponent cannot block and kill Kylox's Voltstrider.
[END OF COMBO PREREQUISITES]
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