Bifur, Melodic Rider + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Umbral Collar Zealot

RWB identity

Commander legal

The 3 combo pieces

• Bifur, Melodic Rider
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• Umbral Collar Zealot

How to execute it

1. Activate Umbral Collar Zealot by sacrificing Bifur.
2. When Bifur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Bifur enters, it triggers, putting a +1/+1 counter on it.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.

What the combo produces

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