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I almost considered making it optional. The interesting part is, Marshadow’s Shades of Imitation attack lets your opponent’s active Pokémon copy one of your attacks at the end of your turn… as the downside for what is otherwise Trickster GX without the GX downside, on a single prize basic.

It’s attack cost (one Psychic and one Colorless) is flexible enough that you can tech it into most decks, but unless your strategy revolves around this Pokémon, you will probably have a benched Pokémon whose attack your opponent can copy to Knock Out Marshadow… before getting a crack at another of your Pokémon at the end of the turn.