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A couple of creatures that care about instant and sorcery spells are likely worth a few slots too, like Niblis of Frost and Wizards of Thay

or discarded from the hand with Loading

In the fourth generation, they were replaced by Pokmon LV.X

That requirement is indeed a drawback, plus there's nothing here to add to your mana, but otherwise, this Uncharted Secret Lair treasure hunter is a good way to use an opponent's strategy against them

Card Set(s) -Two Legends- [OP-08] CARD VIEW OP08-116 | C | EVENT Burn Bazooka Block Icon 2 Type Sky Island/Shandian Warrior Effect [Counter] Up to 1 of your Leader or Character cards gains +4000 power during this battle