Captain Kathryn Janeway without a -1/-1 counter on it).
Notable Prerequisites
The top card of your library is a nonland card.
Steps
Activate
Umbral Collar Zealot by sacrificing
Captain Kathryn Janeway.
When
Captain Kathryn Janeway dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
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.
Resolve the
Umbral Collar Zealot ability.
Repeat.
Results
Infinite ETB.
Infinite LTB.
Infinite death triggers.
Infinite sacrifice triggers.
Infinite surveil.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).