the front side of Chthonian Nightmare
the back of a classic MtG card
the front side of Time Stretch
the back of a classic MtG card
the front side of Timeless Witness
the back of a classic MtG card

Color Identity: B, G, U

Initial Card State

  1.  Timeless Witness in your graveyard.
  2.  Chthonian Nightmare and Time Stretch in hand.

Notable Prerequisites

  1. You control a nontoken creature with mana value 2 or less.
  2. You have at least an energy counter.

Mana Needed

  1. eight generic manaone blue manaone blue mana the first turn, with ten generic manaone blue manaone blue manaone black manaone black mana each extra turn available.

Steps

  1. Cast Time Stretch by paying eight generic manaone blue manaone blue mana, causing you to take two extra turns after this one.
  2. Move to your next turn.
  3. Cast Chthonian Nightmare by paying one generic manaone black mana.
  4. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get an energy counteran energy counteran energy counter.
  5. Activate Chthonian Nightmare by paying an energy counteran energy counteran energy counteran energy counter, 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 one generic manaone black mana.
  8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get an energy counteran energy counteran energy counter.
  9. Activate Chthonian Nightmare by paying at most an energy counteran energy counter, 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.

Notes

  1. You can split the mana costs between the two turns by casting Chthonian Nightmare during the first extra turn and then casting Time Stretch during the second turn. This would split the cost to two generic manaone black manaone black mana during odd-numbered extra turns and eight generic manaone blue manaone blue mana during even-numbered extra turns.

Results

  1. Infinite turns.

Variants of this combo

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