Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the
Dross Scorpion trigger, untapping
Cauldron of Souls.
Repeat.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite colored mana.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite colorless mana.
Metadata
In 28 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).