Agatha's Soul Cauldron + Spike Feeder + Ageless Entity

Agatha's Soul Cauldron

Spike Feeder

Ageless Entity

How it works

1. Activate Ageless Entity using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
2. Ageless Entity triggers, putting two +1/+1 counters on itself.
3. Repeat.

This clever engine turns simple life gain into an endless loop by leveraging Agatha's Soul Cauldron to grant Spike Feeder's activated abilities to Ageless Entity. Once the Cauldron has exiled a creature with the necessary capability, Ageless Entity can strip away its own +1/+1 counters to fuel the life-gain ability. Because Ageless Entity's static triggered ability responds to that exact life gain by immediately replacing the spent counters with even more, the cycle feeds endlessly into infinite lifegain and infinitely large creatures.