Captain Kathryn Janeway without a -1/-1 counter on it).
Notable Prerequisites
The top card of your library is a nonland card.
Steps
Activate
Shilgengar 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
Shilgengar ability.
Repeat.
Results
Infinite Blood tokens.
Infinite creature ETB.
Infinite creature LTB.
Infinite death triggers.
Infinite creature sacrifice triggers.
Infinite artifact tokens.
Metadata
In 1 deck according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).