Workhorse has exactly one +1/+1 counter on it available.
Steps
Activate
Workhorse by removing a +1/+1 counter from it, adding ({C} magic symbol) .
Repeat step 1 until
Workhorse dies as a state-based action due to having 0 toughness.
The Cauldron of Eternity triggers, putting
Workhorse from your graveyard onto the bottom of your library.
Activate
Grenzo by paying ({2} magic symbol) , putting
Workhorse from the bottom of your library into your graveyard, and then putting it onto the battlefield with four +1/+1 counters on it due to its static effect.
Repeat.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite death triggers.
Infinite colorless mana.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.