Agatha's Soul Cauldron + Kiki-Jiki, Mirror Breaker + Combine Guildmage

Agatha's Soul Cauldron

Kiki-Jiki, Mirror Breaker

Combine Guildmage

How it works

1. Activate Combine Guildmage's first ability by paying 1 and tapping it, causing each creature you control to enter the battlefield with an additional +1/+1 counter on it this turn.
2. Activate a creature you control with a +1/+1 counter on it using Kiki-Jiki's ability by tapping it, creating a token copy of any nonlegendary creature you control with haste that enters the battlefield with at least one +1/+1 counter on it due to Combine Guildmage.
3. Repeat step 2.

This clever loop lets you endlessly duplicate nonlegendary creatures by leveraging Agatha's Soul Cauldron to grant Kiki-Jiki, Mirror Breaker's tap ability to your other creatures. To make this work, Combine Guildmage ensures that your newly created token copies enter the battlefield with an extra +1/+1 counter already on them. Because those tokens now carry a +1/+1 counter, they inherit the stolen Kiki-Jiki ability through the Cauldron's static text, allowing them to immediately tap and create *another* copy. The result is an unstoppable chain reaction generating infinite creature tokens, enter-the-battlefield triggers, and sacrifice fodder.