Arcbound Tracker dies, its modular ability and persist ability trigger.
Resolve the modular trigger, putting
Arcbound Tracker's +1/+1 counters on another artifact creature.
Resolve the persist trigger, returning
Arcbound Tracker from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
Resolve the
Evereth ability.
Repeat.
Notes
If you have a way to kill
Evereth and 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 +1/+1 counters on certain creatures.
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite damage.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
1
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3
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5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.