There is at least one counter on a permanent you control except Xavier Sal.
Xavier Sal does not have summoning sickness.
You control at least one additional nontoken Human, Fungus and/or Pirate that has no more than one +1/+1 counter on it.
Steps
Activate Xavier Sal's first ability by tapping it and removing a +1/+1 counter from the additional nontoken Human, Fungus and/or Pirate if it has one, or any counter from another permanent you control otherwise.
Xavier Sal triggers, causing it and all other creatures you control that share a creature type with it to get +2/+0 and gain undying until end of turn.
Resolve the Xavier Sal ability, causing you to populate.
If you created a creature token, Blasting Station triggers when the creature token enters the battlefield, untapping Blasting Station.
Activate Blasting Station by tapping it and sacrificing the additional Human, Fungus and/or Pirate.
When the creature dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When the creature enters the battlefield, Intruder Alarm and Blasting Station trigger.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the Blasting Station trigger, untapping it.
Resolve the Blasting Station ability from step 5, dealing 1 damage to any target.
Repeat.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite damage.
Infinite untap of all creatures.
Infinite mana creatures you control can produce.
Infinitely powerful Humans, Fungi and Pirates you control until end of turn.