For the sake of sanctioned play, players are meant to refer to the card's Oracle Text as opposed to what's physically written on the card
Yes, granting a creature hexproof will stop a targeted fight spell from resolving , since fight spells or abilities need to target the two creatures involved
Pulling one of these Bobblehead cards is only available through packs and boosters, so thats your best bet at grabbing one
As for the art card, that will be a part of the new Set Boosters, which have been designed to make a booster opening more exciting, offering an art card on top, followed by a set of interconnected cards and rarities
The "Unrivaled Lethality" ability literally doubles all damage he would deal
Was released on December 2, 2022