Like most Magic: The Gathering cards, the value of Xanathar, Guild Kingpin depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Adventures in the Forgotten Realms Promos)
If you do manage to defeat the Battle, you get a three-power Creature that gives your non-Creature spells Convoke, which in conjunction with the Kraken tokens is a great ability if your deck is built around it
The big thing to note for alternate arts in the set, and the new approach to sets, is a Headliner Card. In Innistrad Remastered , this is Edgar Markov
Card not found is a combination of Card not found and Card not found, but taking the comparative weaknesses of each of them and putting them into the same card
That means absurd early plays