Among the important signs there is the inscription "Edition" and the date of printing no later than February 16, 1999
1 Trainer Card as a reward
It wouldve been better if it could only inflict 800 damage directly as an effect at the cost of its attack or if the deck had even one spell or trap which activated if the player dealt damage, like with the Gaia monsters
Punishing Damage: Whereas Incremental Damage is often triggered by your efforts, other forms hurt opponents whenever they make certain plays (Cemetery Gatekeeper, Harsh Mentor, Eidolon of the Great Revel, Zo-Zu the Punisher, Manabarbs), limiting their choices in what plays can be safely made as the game progresses
And from the same set, the Gold cards of Solgaleo GX and Lunala GX
This only triggers once per attack, and then you have three random Vampires in here plus one in the Command Zone, so that's likely