This loop spins into motion the moment you gain any amount of life, thanks to Cleric Class ensuring that every single life-gaining event—including the gentle trickle provided by Daxos, Blessed by the Sun—is amplified. That incoming life triggers Cleric Class's Level 2 ability to place a +1/+1 counter onto Scurry Oak, which in turn wakes up Scurry Oak's own triggered ability to spit out a Squirrel token. Because Daxos, Blessed by the Sun is watching the battlefield, that new token's arrival triggers him to grant you life, feeding right back into Cleric Class and letting you cycle the entire loop endlessly for an infinite army of tokens and counters.