Xavier Sal, Infested Captain + Experiment Kraj + Cinderhaze Wretch + Forensic Researcher

Xavier Sal, Infested Captain

Experiment Kraj

Cinderhaze Wretch

Forensic Researcher

How it works

1. Activate Experiment Kraj using Cinderhaze Wretch's second ability by putting a -1/-1 counter on it, untapping it.
2. Activate Xavier Sal's first ability by tapping it and removing a -1/-1 counter from Experiment Kraj, creating a copy of any creature token you control.
3. Activate Experiment Kraj using Forensic Researcher's first ability by tapping it, untapping Xavier Sal.
4. Repeat.