Leyline of Mutation + Morophon, the Boundless + Whitemane Lion

WUBRG identity

Commander legal

The 3 combo pieces

• Leyline of Mutation
• Morophon, the Boundless
• Whitemane Lion

How to execute it

1. Cast Whitemane Lion by paying {0}.
2. When Whitemane Lion enters, it triggers, returning itself from the battlefield to your hand.
3. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite ETB
• Infinite storm count