Metastatic Evangel + Evolution Witness + Chamber Sentry

Metastatic Evangel

Evolution Witness

Chamber Sentry

How it works

1. Cast Chamber Sentry by paying 0.
2. Chamber Sentry enters and dies as a state-based action due to having 0 toughness.
3. Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
4. Evolution Witness triggers, returning Chamber Sentry from your graveyard to your hand.
5. Repeat.

This clever loop transforms the tragedy of a zero-mana Chamber Sentry instantly perishing into an engine of endless growth. As the Sentry hits the graveyard, Metastatic Evangel triggers to proliferate, placing a crucial +1/+1 counter on Evolution Witness. That counter drop awakens Evolution Witness's triggered ability, allowing you to scoop the Chamber Sentry right back to your hand and ready the loop all over again.