Geist-Fueled Scarecrow 4 Artifact Creature Scarecrow 4/4 Creature spells you cast cost 1 more to cast
Mike, Marco and the rest of their team communicated every step of the process
Authenticity matters, though, because some "errors" are just damage or fakes, so compare against documented examples before assuming a premium
Like most Magic: The Gathering cards, the value of Spider-Man, Brooklyn Visionary 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 (Marvel's Spider-Man)
The Hullbreacher draws a new hand and gets dozens of treasure, everyone else just loses their whole hand
It is still a creature spell, of that name, with the CMC of the original card (not the mutate cost)