Infinite creature ETBInfinite lifegain triggersInfinite lifegainInfinite creature tokensInfinite +1/+1 counters on creatures you control
How it works
Gain life.
Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
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 loop relies on a clever, self-sustaining feedback loop of life gain and creature generation powered by Archangel of Thune and Auriok Champion. Once you trigger a single instance of life gain, Archangel of Thune pumps your entire team with +1/+1 counters, which immediately provokes Scurry Oak into spitting out a fresh Squirrel token. That entering token triggers Auriok Champion to gain you 1 life, which feeds right back into Archangel of Thune to restart the entire sequence.