Bolas's Citadel + Mortuary + Shield Sphere + Umbral Collar Zealot

B identity

Commander legal

The 4 combo pieces

• Bolas's Citadel
• Mortuary
• Shield Sphere
• Umbral Collar Zealot

How to execute it

1. Activate Umbral Collar Zealot 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 Umbral Collar Zealot ability.
4. Cast Shield Sphere from the top of your library by paying 0 life.
5. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers
• Infinite storm count
• Infinite surveil