yugioh card mirror : DPRP-EN028 1st Ed Dragon's Rare if you control Dark Magician Dream Mirror | Yu-Gi-Oh! Wiki

The effect basically gives the effect of negating a monster's effect for 1 turn whenever you discard or use one of your Kuribohs as a hand trap

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Nonetheless, it is still a beautiful card, and we can easily see why

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Combined with Suspicious Food Tin, which heals 80 damage if you discard a Psychic Energy, and Mallow & Lana, which can switch + heal 120 damage, Gardevoir VMAX becomes a force to reckon with, capable of both aggressive damage and healing support

Even if theyre inconsequential in the long run, both of these changes are massive problems for MTG