Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Umbral Collar Zealot, and Captain Kathryn Janeway

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Umbral Collar Zealot on the battlefield
• Captain Kathryn Janeway on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Captain Kathryn Janeway
2. When Captain Kathryn Janeway dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Captain Kathryn Janeway enters, it triggers, revealing the top card of your library, putting the card back on top of your library, and then putting a +1/+1 counter on Captain Kathryn Janeway
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil