Scurry Oak + Auriok Champion + The Destined White Mage
Scurry Oak
Auriok Champion
The Destined White Mage
Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature tokensInfinite lifegainInfinite lifegain triggers
How it works
Gain life.
The Destined White Mage triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a creature token.
When the creature token enters the battlefield, Auriok Champion triggers, causing you to gain 1 life.
Repeat from step 2.
This lovely little engine starts turning the moment you gain life to trigger The Destined White Mage, placing a +1/+1 counter onto Scurry Oak. That counter placement coaxes Scurry Oak into spitting out a fresh 1/1 Squirrel token, which immediately prompts Auriok Champion to grant you a point of life simply by entering the battlefield. That new life closes the loop, looping right back into The Destined White Mage to keep the counters and tokens flowing endlessly.