Maybe it is because it's an old artwork from The Witcher 3 Gwent. There's only a few cards from it but most of them don't have a Premium version : there's Eithné, Cows of Germain, Hjalmar's Lord of Undvik, Harpy Hatchlings spawned from eggs, Arachas Hatchlings spawned from Behemots, Toad Prince...