Animation Module + Intruder Alarm + Railway Brawler

Animation Module

Intruder Alarm

Railway Brawler

How it works

1. Cause a creature to enter the battlefield
2. Intruder Alarm and Railway Brawler trigger.
3. Resolve the Intruder Alarm trigger, untapping all creatures.
4. Holding priority, activate a mana-producing creature by tapping it, adding at least 1.
5. Resolve the Railway Brawler trigger, putting a +1/+1 counter on the creature that entered the battlefield.
6. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
7. Repeat from step 2.