Saint Louis MTG

well first off feral contest is a sorcery, so the order of operations will not work here. but assuming he cast feral and then attacked i dont believe kazuul has to block. since the token is not requried to block, i would say that you have the option to block or not. meaning that kazuul would not have to block along with the token.

509.1c The defending player checks each creature he or she controls to see whether it's affected by any requirements (effects that say a creature must block, or that it must block if some condition is met). If the number of requirements that are being obeyed is fewer than the maximum possible number of requirements that could be obeyed without disobeying any restrictions, the declaration of blockers is illegal. Tapped creatures and creatures with unpaid costs to block are exempt from effects that would require them to block.

Example: A player controls one creature that "blocks if able" and another creature with no abilities. An effect states, "Creatures can't be blocked except by two or more creatures." Having only the first creature block violates the restriction. Having neither creature block fulfills the restriction but not the requirement. Having both creatures block the same attacking creature fulfills both the restriction and the requirement, so that's the only option.