Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + White Widow, Free Agent + Yahenni, Undying Partisan

WB identity

Commander legal

The 3 combo pieces

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• White Widow, Free Agent
• Yahenni, Undying Partisan

How to execute it

1. Activate Yahenni by sacrificing White Widow.
2. When White Widow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When White Widow enters, it triggers, putting a +1/+1 counter on it and up to one other creature.
4. Resolve the Yahenni ability.
5. Repeat.

What the combo produces

• Infinite +1/+1 counters on creatures you control
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers