Animation Module + Krark-Clan Ironworks + Cleric Class + Leyline of Vitality

Animation Module

Krark-Clan Ironworks

Cleric Class

Leyline of Vitality

How it works

1. Gain life.
2. Cleric Class triggers, putting a +1/+1 counter on a creature you control.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. When the Servo enters, Leyline of Vitality triggers, causing you to gain life.
5. Cleric Class triggers. Holding priority, activate Krark-Clan Ironworks by sacrificing the Servo, adding CC.
6. Resolve the Cleric Class trigger, putting a +1/+1 counter on a creature you control.
7. Repeat from step 3.

This self-sustaining loop spins into infinity the moment you gain a single point of life, which is easily kickstarted by Leyline of Vitality whenever any creature enters the battlefield. Cleric Class translates that life gain into a +1/+1 counter on your creature, which in turn wakes up Animation Module's triggered ability to manufacture a 1/1 Servo artifact creature token for the low cost of {1}. That new Servo's arrival triggers Leyline of Vitality once more to loop the life gain, while Krark-Clan Ironworks stands ready to effortlessly sacrifice the token for mana to fund the Module's ongoing demands, leaving you with infinite colorless mana alongside boundless life and counters.