Custodi Soulbinders without a -1/-1 counter on it).
Easy Prerequisites
There are at least three total creatures on the battlefield.
Steps
Activate
Phantom Train by sacrificing
Custodi Soulbinders.
When
Custodi Soulbinders dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the
Phantom Train ability.
Repeat.
Results
Infinite +1/+1 counters on a creature.
Infinite creature ETB.
Infinite creature LTB.
Infinite death triggers.
Infinite creature sacrifice triggers.
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.