How can you create a combo with Mnemonic Wall, Followed Footsteps, Time Stretch?
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[START OF COMBO]This combo can be formed with Mnemonic Wall, Followed Footsteps, Time Stretch

Color identity: U
Mana cost: {8}{U}{U} each turn
Steps:
  1. Cast Time Stretch by paying {8}{U}{U}, taking two extra turns after this one.
  2. At the beginning of your upkeep on your next extra turn, Followed Footsteps triggers, creating a token copy of Mnemonic Wall.
  3. Mnemonic Wall enters the battlefield, returning Time Stretch from your graveyard to your hand.
  4. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Mnemonic Wall must be on the battlefield
  - Followed Footsteps must be on the battlefield
  - Time Stretch must be in your hand
  - Followed Footsteps attached to Mnemonic Wall.
[END OF COMBO PREREQUISITES]
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