Doubling Cube + Rings of Brighthearth + Voltaic Key

Mana needed: {10}

C identity

Commander legal

The 3 combo pieces

How to execute it

  1. Float {10} mana in your mana pool.
  2. Activate Doubling Cube by paying {3} and tapping it, causing you to add {7}.
  3. Activate Voltaic Key by paying {1} and tapping it, targeting Doubling Cube.
  4. Rings of Brighthearth triggers, causing you to pay {2} to copy Voltaic Key's ability, targeting Voltaic Key.
  5. Resolve both Voltaic Key abilities, untapping Voltaic Key and Doubling Cube.
  6. Repeat from step 2.

What the combo produces