This ingenious loop relies on Squee, the Immortal's unique ability to be repeatedly cast straight from exile or the graveyard, fueling a self-sustaining engine of creation and sacrifice. Each time Squee hits the stack, Iraxxa, Empress of Mars triggers its Paradox ability because the spell originates from outside your hand, producing an Alien Warrior token that is immediately doubled into a pair of tokens thanks to Exalted Sunborn's brilliant replacement effect. You then feed those generated tokens and Squee itself directly into Phyrexian Altar to recoup the exact mana needed to cast Squee again. Because Exalted Sunborn doubles your token yield beyond what Iraxxa normally provides, the Altar yields a net surplus of mana and sacrifices to repeat the cycle indefinitely.