Dominion Saboteur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it. Choose to have it enter as a copy of the creature with persist with a +1/+1 counter on it.
Remove a +1/+1 counter and a -1/-1 counter from
Dominion Saboteur as a state-based action.
Repeat.
Results
Infinite colorless mana.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Metadata
In 9 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).