Animation Module + Intruder Alarm + Metallic Mimic

Animation Module

Intruder Alarm

Metallic Mimic

How it works

1. Put a +1/+1 counter on a creature you control, triggering Animation Module.
2. Holding priority, activate a mana-producing creature by tapping it, adding at least 1.
3. Resolve the Animation Module trigger, causing you to create a 1/1 Servo artifact creature token that enters the battlefield with at least one +1/+1 counter on it due to Metallic Mimic.
4. Intruder Alarm and Animation Module trigger.
5. Resolve the Intruder Alarm trigger, untapping all creatures.
6. Repeat from step 2.