There is at least one counter on a permanent you control.
You control at least one creature token.
({1} magic symbol) ({R} magic symbol) available.
Steps
Cast First Day of Class by paying ({1} magic symbol) ({R} magic symbol) .
Activate Xavier Sal's first ability by tapping it and removing a counter from a permanent you control, creating a copy of any creature token you control.
When the creature token enters the battlefield, Intruder Alarm and First Day of Class trigger.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the First Day of Class trigger, putting a +1/+1 counter on the creature token.