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Malevolent Hermit saw quite a bit of play throughout its three years in Standard as a way for tempo and midrange decks to fight against control, with its front half sacrificing itself to counter non-creature spells and its back half making your non-creature spells uncounterable

Card Search Search result Card-Type is "Xyz Monster"

Nicolas, however, tries to crash the player's Duel Runner, but he ends up crashing instead due to Primo

But of course, just dropping a whole cycle of ubiquitous, meta-shifting power cards will always cause waves in any format (spoilers for the second half of this list!)

So much so, that we even labeled it as one of the best green cards of all time recently

This is certainly one of the more obscure things to be protected from, but it fits into the game perfectly from a gameplay and theme standpoint