It was presented to winners as a prize card in the 2007 Shonen Jump Championship and can be used to summon any other card in the deck
A Reckoning Approaches Like Perhaps You've Met My Cohort, A Reckoning Approaches allows you to cheat an incredibly expensive and impactful creature into play, but it can fail
Pokemon Power: Prehistoric Power says that once Aerodactyl is on the field, no more evolution cards can be played which completely iced out major archetypes that were flooding the competitive scene at the time, such as Rain Dance and Damage Swap
There are 1,103 PSA Graded 10 of these in the world
While its not on the level of, say, Prismatic Evolutions , it has a solid foundation and might potentially grow into a great investment down the line
Why do you consider this set to be objectively bad