Agatha's Soul Cauldron, Kragma Butcher, and Kelpie Guide

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Kragma Butcher on the battlefield
• Kelpie Guide in exile

Steps

1. Activate Kragma Butcher using Kelpie Guide's ability by tapping it, untapping another creature you control that has a +1/+1 counter on it
2. Activate the other creature using Kelpie Guide's ability by tapping it, untapping Kragma Butcher Kragma Butcher triggers, giving it +2/+0 until end of turn
3. Repeat

Results

• Infinitely powerful creature until end of turn