Loyal Retainers + Karmic Guide + Blasting Station + Chameleon, Master of Disguise

Loyal Retainers

Karmic Guide

Blasting Station

Chameleon, Master of Disguise

How it works

1. Activate Loyal Retainers by sacrificing it, returning Chameleon from your graveyard to the battlefield as a copy of Karmic Guide.
2. When Chameleon enters the battlefield, it and Blasting Station trigger.
3. Resolve the Chameleon trigger, returning Loyal Retainers from your graveyard to the battlefield.
4. When Loyal Retainers enters, Blasting Station triggers. Resolve both triggers from this step and step 2, untapping Blasting Station.
5. Activate Blasting Station by tapping it and sacrificing Chameleon.
6. Repeat.