While this might smack a bit of market manipulation, this card partners with Brallin, Skyshark Rider and any decks piloting both of them will want to be looting constantly to gain the benefits of their triggers and help each creature grow quickly
Apart from that, the art is pretty cool
Kiora, the Crashing Wave Kiora isn't the best planeswalker at all, she is fine
Uncommon Retro Artifacts are found roughly 66% of the time, rare cards roughly 27% of the time, and mythic care cards roughly 7% of the time. Staggering Value Crunching the numbers means theres roughly a 0.08% or one in 1,300 chance of finding a mythic serialized Retro Artifact
There isn't a single right answer, but here's how to think about it
Specifically if you can meet them and see the cards in person and they allow you to verify its authenticity or provide you with authenticity verification paperwork