Bolas's Citadel + Grinding Station + Mortuary + Shield Sphere

B identity

Commander legal

The 4 combo pieces

• Bolas's Citadel
• Grinding Station
• Mortuary
• Shield Sphere

How to execute it

1. Activate Grinding Station by tapping it and 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 Grinding Station ability.
4. Cast Shield Sphere from the top of your library by paying 0 life.
5. When Shield Sphere enters, Grinding Station triggers, untapping Grinding Station.
6. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite storm count