Agatha's Soul Cauldron + Inquisitive Puppet + Bioengineered Future

Agatha's Soul Cauldron

Inquisitive Puppet

Bioengineered Future

How it works

1. 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 a +1/+1 counter on it due to Bioengineered Future.
2. Repeat using the Human token instead.

This clever loop turns Inquisitive Puppet's sacrifice ability into an infinite engine, powered entirely by the infrastructure of your battlefield. With Bioengineered Future granting your creatures extra +1/+1 counters as they enter, every token born from the Puppet's sacrifice is immediately ready to sacrifice itself in turn. Agatha's Soul Cauldron ties the whole mechanism together by granting your creatures the exiled Puppet's ability while ensuring the Cauldron itself can fuel the graveyard recursion and counter placement needed to keep the chain unbroken.