Xavier Sal, Infested Captain + Intruder Alarm + Jyoti, Moag Ancient + Territorial Scythecat

Xavier Sal, Infested Captain

Intruder Alarm

Jyoti, Moag Ancient

Territorial Scythecat

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 Territorial Scythecat trigger.
3. Resolve the Territorial Scythecat trigger, putting a counter on a creature you control.
4. Resolve the Intruder Alarm trigger, untapping all creatures.
5. Repeat.

This loop is a masterclass in recursive token generation, hinging on Jyoti, Moag Ancient's ability to supply the initial Forest Dryad token upon entering the command zone. By activating Xavier Sal, Infested Captain to populate that token using a counter from Territorial Scythecat, every new copy triggers Intruder Alarm to untap Xavier Sal for the next iteration. Meanwhile, every single dryad entering the battlefield feeds Territorial Scythecat's landfall ability, growing it larger with infinite +1/+1 counters while generating an endless army of land creature tokens.