However, this change was made recently for the English version of the card game, with the first documented silver-border cards appearing regularly with the release of the Scarlet & Violet Base Set in 2023
Players must abide by this rule even if all four of the cards are different completely different
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So as far as strategy goes I would recommend definitely stacking up energy on Slaking before you play it since you can't afford to wait around to do damage since attacks will be increased by 50 when you do attack, I would definitely try to find a way where you could use Best Dash and then somehow retreat Slaking the next turn for free so you could attack again, but you may be able to last quite a long time if you get Slaking out in play as soon as possible so you can knock out almost every Pokemon in one turn and then hope your opponent has a weak Pokemon the next turn so that it won't be able to do more than 60 damage total, that way with a potion or two you can last at least 3 turns and knock out 3 Pokemon
Similar to the old Lanterns from The First Chapter, it allows you to play the next character for one ink less
While "Dragon Rulers" were the far more popular deck, and they have more relevancy in the modern day, "Spellbook" was an intriguing powerhouse in its own right, as its numerous spell cards made it able to adapt to every matchup