Basking Broodscale + Cleric Class + Lifecreed Duo

Basking Broodscale

Cleric Class

Lifecreed Duo

How it works

1. Gain life.
2. Cleric Class triggers, putting a +1/+1 counter on Basking Broodscale.
3. Basking Broodscale triggers, creating a creature token.
4. When the creature token enters the battlefield, Lifecreed Duo triggers, causing you to gain 2 life.
5. Repeat from step 2.

This brilliant loop starts simply when you gain life, which immediately triggers Cleric Class at its second level to place a +1/+1 counter on Basking Broodscale. That counter placement triggers Basking Broodscale's ability to create an Eldrazi Spawn token, and the arrival of that new token causes Lifecreed Duo to trigger and reward you with 2 life. Because that lifegain restarts Cleric Class, the entire sequence feeds endlessly into itself to generate infinite lifegain, endless creature tokens, and towering +1/+1 counters.