Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
Herd Baloth triggers, creating a creature token and an artifact token.
When the artifact token enters the battlefield, Arbaaz Mir triggers, dealing 1 damage to each opponent and causing you to gain 1 life.
Repeat from step 2.
This dynamic loop turns a single instance of life-gaining into an unstoppable engine of growth and destruction. Once Archangel of Thune distributes a +1/+1 counter across your board, Herd Baloth responds by spawning a Beast token, which in turn causes Peregrin Took's replacement effect to sweeten the deal by adding an extra Food token to the mix. The entry of that artifact triggers Arbaaz Mir to deal damage and regain life, looping right back into Archangel of Thune to restart the entire cascade.