How it works
Prerequisites
- Xavier Sal does not have summoning sickness.
- You control at least one nonlegendary creature token.
- There is at least one counter on a permanent you control.
Steps
- 1Activate Xavier Sal's first ability by removing a counter from a permanent you control, creating a copy of a creature token you control that enters the battlefield with two +1/+1 counters on it due to Master Biomancer.
- 2When the creature token enters the battlefield, Intruder Alarm triggers, untapping all creatures.
- 3Repeat.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?