Bolas's Citadel + Mortuary + Shield Sphere + Yahenni, Undying Partisan

B identity

Commander legal

The 4 combo pieces

How to execute it

  1. Activate Yahenni by sacrificing Shield Sphere
  2. When Shield Sphere dies, Mortuary triggers, putting Shield Sphere from your graveyard onto the top of your library.
  3. Resolve the Yahenni ability.
  4. Cast Shield Sphere from the top of your library by paying 0 life.
  5. Repeat.

What the combo produces