When Whitemane Lion enters the battlefield, it and Arahbo trigger.
Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand.
Resolve the Arahbo trigger, creating a 1/1 Cat and a 1/1 Frog creature token.
Activate Phyrexian Altar twice by sacrificing the Cat and Frog, adding 1.
Repeat.
This delightful loop centers on the self-returning nature of Whitemane Lion, which continually bounces itself back to your hand upon entering the battlefield. While this usually just resets a creature, here it triggers Arahbo, the First Fang to generate a Cat token, which Quina, Qu Gourmet amplifies by generously tossing in a Frog token alongside it. You can then feed both newly minted creatures to Phyrexian Altar to generate the exact mana needed to cast Whitemane Lion all over again.