Time Stretch + Timeless Witness Combos

4 known combos featuring both cards in Commander

Infinite turns Lock Skip your draw steps

Combo 1 with Progenitor Mimic

Also requires: Progenitor Mimic Progenitor Mimic
Results: Infinite turns · Lock
Steps
  1. Cast Time Stretch by paying its mana cost, taking an extra turn after this one.
  2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Timeless Witness.
  3. When the token Timeless Witness enters the battlefield, it triggers itself, returning Time Stretch from your graveyard to your hand.
  4. Repeat during your second extra turn.

Combo 2 with Ghostly Flicker + Mystic Sanctuary

Results: Infinite turns · Skip your draw steps · Lock
Show steps
  1. Activate Mystic Sanctuary by tapping it, adding {U}.
  2. Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
  3. Move to your first extra turn.
  4. Activate Mystic Sanctuary by tapping it, adding {U}.
  5. Cast Ghostly Flicker by paying {2}{U}, blinking Mystic Sanctuary and Timeless Witness.
  6. When Timeless Witness and Mystic Sanctuary enter the battlefield, they trigger.
  7. Resolve the Timeless Witness trigger, returning Ghostly Flicker from your graveyard to your hand.
  8. Resolve the Mystic Sanctuary trigger, putting Time Stretch from your graveyard onto the top of your library.
  9. Move to your next turn, drawing Time Stretch during your draw step.
  10. Repeat.

Combo 3 with Extravagant Replication

Results: Infinite turns · Lock
Show steps
  1. Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one.
  2. Move to your next turn.
  3. At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Timeless Witness.
  4. When the Timeless Witness token enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand.
  5. Repeat during your second turn.

Combo 4 with Chthonian Nightmare

Also requires: Chthonian Nightmare Chthonian Nightmare
Results: Infinite turns · Lock
Show steps
  1. Cast Time Stretch by paying {8}{U}{U}, causing you to take two extra turns after this one.
  2. Move to your next turn.
  3. Cast Chthonian Nightmare by paying {1}{B}.
  4. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  5. Activate Chthonian Nightmare by paying {E}{E}{E}{E}, sacrificing a creature with mana value 2 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Timeless Witness from your graveyard to the battlefield.
  6. When Timeless Witness enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand.
  7. Cast Chthonian Nightmare by paying {1}{B}.
  8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  9. Activate Chthonian Nightmare by paying at most {E}{E}, sacrificing Timeless Witness, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 2 or less from your graveyard to the battlefield.
  10. Repeat during your second turn.
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