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Mew ex has two moves the humble 20-damage Psyshot which costs one Psychic-type energy, but another, far more threatening attack called Genome Hacking, which costs three of any type of energy, and allows you to choose any of the attacks from your opponent's active Pokemon to use yourself, seemingly with no consequences

Cyber Pharos X LIGHT Level 1 [ Machine / Effect ] ATK 0 DEF 2100 You can Special Summon this card (from your hand) by Tributing 1 Machine monster

This can allow for very quick damage and potentially early game wins when the opponent doesnt expect it

You probably have creatures or other dead cards in your hand if youre behind on board