Similarly to Seven Dwarves from Throne of Eldraine, Nazgl allows players to break a formats deckbuilding rules
This unofficial PokMetal card features everyone's favorite electric mouse with a, shall we say, amplified physique
I guess well have to wait and see what other cards come out before judging anything.
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But I would move Serperior into play if you are late in the game and you get a grass Pokemon on your bench that you really want to use right away, you could then use Serperior's Leaf Tornado and get the necessary energy cards on that Pokemon you just put on your bench and retreat Serperior the next turn for only one energy and put that Pokemon into play with the necessary energy cards on it
Do not hesitate, you always use your Leader ability to take one Don on 3 or 4