Arcbound Fiend + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Grinding Station

WB identity

Commander legal

The 3 combo pieces

• Arcbound Fiend
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• Grinding Station

How to execute it

1. Activate Grinding Station by tapping it and sacrificing Arcbound Fiend.
2. When Arcbound Fiend dies, its modular ability and persist ability trigger.
3. Resolve the modular trigger, putting Arcbound Fiend's +1/+1 counters on another artifact creature.
4. Resolve the persist trigger, returning Arcbound Fiend from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
5. When Arcbound Fiend enters, Grinding Station triggers, untapping Grinding Station.
6. Resolve the Grinding Station ability from step 1.
7. Repeat.

What the combo produces

• Infinite +1/+1 counters on certain creatures
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill