Xavier Sal, Infested Captain + Intruder Alarm + Staff of Titania + Obuun, Mul Daya Ancestor

Xavier Sal, Infested Captain

Intruder Alarm

Staff of Titania

Obuun, Mul Daya Ancestor

How it works

1. Activate Xavier Sal by tapping it and removing a counter from a permanent you control, creating a token copy of the Forest Dryad token.
2. When the Forest Dryad enters the battlefield, Intruder Alarm and Obuun trigger.
3. Resolve the Obuun trigger, putting a counter on a creature you control.
4. Resolve the Intruder Alarm trigger, untapping all creatures.
5. Repeat.

This loop relies on Xavier Sal, Infested Captain to repeatedly populate a Forest Dryad token generated by the attack trigger of Staff of Titania, which is equipped to a creature. Each time a new Forest Dryad enters the battlefield, Obuun, Mul Daya Ancestor's landfall ability triggers to place a +1/+1 counter on Xavier Sal, while Intruder Alarm untaps all creatures—including Xavier Sal itself—so the process can immediately begin again. Together, these pieces create an endless cycle of creature entries and untaps fueled by the synergy between population and counters.