Rat King, Verminister + Intruder Alarm + Belonging + Woe Strider

Rat King, Verminister

Intruder Alarm

Belonging

Woe Strider

How it works

1. Cast Belonging by paying 5.
2. When Belonging enters, it and Intruder Alarm trigger.
3. Resolve the Belonging trigger, creating three 1/1 Shapeshifter creature tokens with changeling.
4. When the Shapeshifters enter, Intruder Alarm triggers three times. Resolve the Intruder Alarm triggers from this step and step 2, untapping all creatures four times.
5. Activate Woe Strider by sacrificing Belonging.
6. Activate Rat King by tapping it and sacrificing the Shapeshifters, returning Belonging from your graveyard to the battlefield.
7. Repeat from step 2.