Doubling Cube + Karn, the Great Creator Combos

2 known combos featuring both cards in Commander

Infinite mana permanents you control can produce Infinite untap of creatures you control Infinite mana creatures you control can produce Infinitely large creature until end of turn

Combo 1 with Umbral Mantle

Also requires: Umbral Mantle Umbral Mantle
Results: Infinitely large creature until end of turn · Infinite mana permanents you control can produce · Infinite untap of creatures you control · Infinite mana creatures you control can produce
Steps
  1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
  2. Activate Umbral Mantle's equip ability by paying {0}, attaching it to Doubling Cube.
  3. Float at least {10} in your mana pool.
  4. Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
  5. Activate Doubling Cube by paying {3} and untapping it, giving it +2/+2 until end of turn.
  6. Repeat from step 4.

Combo 2 with Sword of the Paruns

Also requires: Sword of the Paruns Sword of the Paruns
Results: Infinite mana permanents you control can produce · Infinite untap of creatures you control · Infinite mana creatures you control can produce
Show steps
  1. Float at least {11} in your mana pool.
  2. Activate Doubling Cube by paying {3} and tapping it, adding at least {8}.
  3. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
  4. Activate Sword of the Paruns' equip ability by paying {3}, attaching it to Doubling Cube.
  5. Activate Sword of the Paruns by paying {3}, untapping Doubling Cube.
  6. Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
  7. Repeat from step 5.
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