the front side of Carth the Lion
the back of a classic MtG card
the front side of Karn, the Great Creator
the back of a classic MtG card
the front side of Ugin's Nexus
the back of a classic MtG card
the front side of Oath of Teferi
the back of a classic MtG card
the front side of Ashnod's Altar
the back of a classic MtG card

Color Identity: G, W, U, B

Initial Card State

  1.  All permanents on the battlefield.

Mana Needed

  1. five generic mana each extra turn available.

Steps

  1. Activate Karn's first loyalty ability by putting two loyalty counters on it, causing Ugin's Nexus to become an artifact creature until end of turn.
  2. Activate Ashnod's Altar by exiling Ugin's Nexus, adding one colorless manaone colorless mana.
  3. Ugin's Nexus triggers, causing you to take an extra turn after this one.
  4. Activate Karn's second loyalty ability by removing a loyalty counter from it, returning Ugin's Nexus from exile to your hand.
  5. Move to your next turn.
  6. Cast Ugin's Nexus by paying five generic mana.
  7. Repeat.

Results

  1. Infinite turns.
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