Arlinn, Voice of the Pack has at least three loyalty counters.
Steps
Activate
Arlinn's loyalty ability by removing two loyalty counters from it, creating a 2/2 Wolf creature token that enters the battlefield with a +1/+1 counter on it.
Activate
Xavier Sal's first ability by tapping it and removing the +1/+1 counter from the Wolf token, creating a copy of the Wolf token that enters the battlefield with a +1/+1 counter on it due to
Arlinn.
When the Wolf token enters the battlefield,
Intruder Alarm triggers, untapping all creatures.
Repeat from step 2.
Results
Infinite creature tokens.
Infinite creature ETB.
Infinite mana creatures you control can produce.
Infinite untap of creatures.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, 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.