Moritte of the Frost as a copy of the creature with persist.).
Steps
Activate
Bloodthrone Vampire by sacrificing
Moritte of the Frost.
When
Moritte of the Frost dies, it triggers its persist ability, returning itself to the battlefield as a copy of the creature with persist with two +1/+1 counters and one -1/-1 counter on it.
Remove one +1/+1 counter and one -1/-1 counter from
Moritte of the Frost as a state-based action.
Resolve the activated ability from step 1.
Repeat.
Results
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinitely large creature until end of turn.
Metadata
In 7 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Oddball (Bracket 2-3+).