Inquisitive Puppet in exile (exiled by Agatha's Soul Cauldron).
Agatha's Soul Cauldron and Arwen on the battlefield.
You control another creature that has at least one +1/+1 counter on it.
Steps
Activate another creature you control that has a +1/+1 counter on it by exiling it, creating a 1/1 Human creature token that enters the battlefield with at least one +1/+1 counter on it due to Arwen.