Cast Walking Ballista by paying {0}.
Walking Ballista enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Walking Ballista from your graveyard to your hand.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite death triggers

Infinite storm count

Infinite proliferate

Metastatic Evangel

Evolution Witness

Walking Ballista

Cast Marketback Walker by paying {0}.
Marketback Walker enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Marketback Walker from your graveyard to your hand.
Repeat.

Marketback Walker

Cast Stonecoil Serpent by paying {0}.
Stonecoil Serpent enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Stonecoil Serpent from your graveyard to your hand.
Repeat.

Stonecoil Serpent

Cast Hangarback Walker by paying {0}.
Hangarback Walker enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Hangarback Walker from your graveyard to your hand.
Repeat.

Hangarback Walker

Cast Cryptic Trilobite by paying {0}.
Cryptic Trilobite enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Cryptic Trilobite from your graveyard to your hand.
Repeat.

Cryptic Trilobite

Cast Endless One by paying {0}.
Endless One enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Endless One from your graveyard to your hand.
Repeat.

Endless One

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

Omarthis, Ghostfire Initiate

Cast Ugin's Conjurant by paying {0}.
Ugin's Conjurant enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Ugin's Conjurant from your graveyard to your hand.
Repeat.

Ugin's Conjurant

Cast Shifting Wall by paying {0}.
Shifting Wall enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Shifting Wall from your graveyard to your hand.
Repeat.

Shifting Wall

Cast Phyrexian Marauder by paying {0}.
Phyrexian Marauder enters and dies as a state-based action due to having 0 toughness.
Metastatic Evangel triggers, causing you to proliferate and put a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Phyrexian Marauder from your graveyard to your hand.
Repeat.

Phyrexian Marauder

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

Search Results