There is at least one counter on a permanent you control except
Xavier Sal.
Xavier Sal does not have summoning sickness.
Hyrax Tower Scout 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
Hyrax Tower Scout 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
Hyrax Tower Scout.
When
Hyrax Tower Scout dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When
Hyrax Tower Scout enters the battlefield, it and
Blasting Station trigger.
Resolve the
Hyrax Tower Scout trigger, untapping
Xavier Sal.
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 copies of creature tokens you control.
Infinitely powerful Humans, Fungi and Pirates you control until end of turn except