Jace, Ingenious Mind-Mage + Romana II + The Sixth Doctor

Mana needed: {4}{U}{U}

GWU identity

Commander legal

The 3 combo pieces

What must be in place

You control a mana-producing creature.

How to execute it

  1. Cast Jace by paying {4}{U}{U}.
  2. The Sixth Doctor triggers, copying the Jace spell, with the copy being nonlegendary.
  3. Resolve both Jace spells.
  4. Activate a mana-producing creature by tapping it, adding at least {1}.
  5. Activate Romana II by paying {1} and tapping it, creating a copy of the Jace token.
  6. Activate a Jace token's second loyalty ability by putting a loyalty counter on it, untapping all creatures you control.
  7. Repeat from step 4.

What the combo produces