Resolve the persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it and at least one +1/+1 counter on it due to
Gorma.
Remove a -1/-1 counter and a +1/+1 counter from that creature as a state-based action.
Resolve the
Bloodthrone Vampire ability.
Repeat.
Results
Infinite +1/+1 counters on a creature.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinitely large creature until end of turn.
Metadata
Bracket tag
OddballBracket 2-3+
Probably 2 or 3, 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.