Thopter Squadron + Crystalline Crawler + Yotian Dissident + Panharmonicon

Thopter Squadron

Crystalline Crawler

Yotian Dissident

Panharmonicon

How it works

1. Activate Thopter Squadron's first ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Thopter artifact creature token.
2. When the Thopter enters, Yotian Dissident triggers twice due to Panharmonicon, putting a +1/+1 counter on Thopter Squadron and Crystalline Crawler.
3. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding 1.
4. Repeat.

This loop relies on a clever cycle of counter conversion and artifact generation, anchored by Yotian Dissident and Panharmonicon to multiply your triggers every time a new machine hits the board. By spending mana to activate Thopter Squadron, you create a Thopter token that triggers Yotian Dissident twice thanks to Panharmonicon's doubling effect, distributing two fresh +1/+1 counters back among your creatures. Meanwhile, Crystalline Crawler acts as both a counter sink and a mana source, letting you strip away a counter to fund Thopter Squadron's ability while easily absorbing the replacement counters generated by your triggers.