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Mewtwo's base psychic attack might seem a little underwhelming because this card's actual power lies in Barrier

I prefer these to Flayer, Herald of Secret Streams, etc since they help you come from behind when Marchesa isn't out, and having "finishers" that rely on your engine being all in place isn't all that effectively different from just running some combo (Metallic Mimic / Murderous Redcap is the most efficient one for Marchesa imo if you wanted to go the route)

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If you call it right then your opponents monsters attack becomes 0 until the end of the battle phase