This clever loop turns a single initial life gain into an unstoppable cascade of growth and token generation. It all hinges on Scurry Oak, whose ability to spawn a token whenever it receives +1/+1 counters acts as the engine's beating heart. That new token naturally satisfies Prosperous Innkeeper's soul sister ability, gently feeding you 1 life. That tiny bump in health immediately catches the attention of Light of Promise, which repays the favor by dumping fresh +1/+1 counters back onto Scurry Oak, restarting the entire cycle anew.