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While its natural for flashy mythics like Vivi Ornitier to garner a lot of attention, there are plenty of low rarity cards that have made a name for themselves
Every card is different, and even if I do the same card twice, it never looks the same
are you thinking of brewing a deck full of Horrors
We can never know for sure whether a set or a specific card will shoot up in value, or potentially fall flat after it becomes readily available, but considering how well, every expansion has gone recently, I expect it to be highly sought after