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
In 162 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Oddball (Bracket 2-3+).