Xavier Sal, Infested Captain + Animation Module + Thornbite Staff + Iceberg

Xavier Sal, Infested Captain

Animation Module

Thornbite Staff

Iceberg

How it works

1. Activate Xavier Sal's second ability by tapping it and sacrificing a creature.
2. When the creature dies, Xavier Sal triggers, untapping Xavier Sal.
3. Resolve the Xavier Sal ability from step 1, putting a +1/+1 counter on a creature you control and an ice counter on Iceberg.
4. Animation Module triggers, holding priority, activate Iceberg's second ability by removing an ice counter from it, adding C.
5. Resolve the Animation Module trigger, causing you to pay 1 to create a 1/1 Servo artifact creature token.
6. Repeat.
7. Once you have infinite +1/+1 counters among creatures you control, you may instead use Xavier Sal's first ability to get infinite copies of creature tokens you control.