Treebeard, Gracious Host + Scurry Oak + Verdant Sun's Avatar

Treebeard, Gracious Host

Scurry Oak

Verdant Sun's Avatar

How it works

1. Gain life.
2. Treebeard's second ability triggers, putting that many +1/+1 counters on Scurry Oak.
3. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
4. When the Squirrel enters the battlefield, Verdant Sun's Avatar triggers, causing you to gain life.
5. Repeat from step 2.

This loop transforms any initial source of life-gaining momentum into an unstoppable cascade of growth and creatures. Once you kick things off, Scurry Oak acts as the engine by dropping a 1/1 Squirrel token whenever it receives +1/+1 counters. That new token entering the battlefield immediately makes Verdant Sun's Avatar trigger its life-gain ability based on the creature's toughness, which in turn feeds right back into Treebeard, Gracious Host to pump more +1/+1 counters onto Scurry Oak.