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You cannot Special Summon monsters from the Extra Deck the turn you activate this effect, except Xyz Monsters

However, it can lead to just a handful of decks becoming dominant, able to beat any other decks they face - and thus the game's overall scene (often called its 'meta') becomes very samey, as everyone is forced to play with similar decks and cards if they want to have a chance of winning games

Her father, Hideo, is established in her backstory as a senator who is constantly busy with his work and never has time for her, and the one time they do spend time together, she awakens her Psychic Powers that turn her cards real, injuring him in the process

Five-Headed Dragon and Cyberdark Dragon Special Summon Five-Headed Dragon

So if you can find some, I assume they are non-violent