Cloudstone Curio + Necroduality + Rooftop Storm

U identity

Commander legal

The 3 combo pieces

What must be in place

You have a nonlegendary, nonartifact Zombie card in hand.

How to execute it

  1. Cast a nonlegendary, nonartifact Zombie by paying {0}.
  2. The Zombie enters the battlefield, triggering Cloudstone Curio and Necroduality.
  3. Resolve the Cloudstone Curio trigger, returning nothing to your hand.
  4. Resolve the Necroduality trigger, creating a token copy of the Zombie.
  5. Cloudstone Curio triggers, returning the nontoken Zombie to your hand.
  6. Repeat.

What the combo produces