Persist Creatures does not have a -1/-1 counter on it.
Steps
Activate
Evereth by sacrificing a
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Persist Creature that does not have a -1/-1 counter on it.
When the creature dies, its persist ability and
Bhaal trigger.
Resolve the
Bhaal trigger, putting a +1/+1 counter on the remaining
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Persist Creature.
Resolve the sacrificed creature's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the
Evereth ability from step 1.
Repeat.
Notes
If you have a way to kill
Evereth and ({1} magic symbol) ({BR} magic symbol) available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite damage.
Metadata
In 35 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).