When your opponent activates a Spell/Trap Card while you control a "Magikey" Ritual Monster or a "Magikey" monster Special Summoned from the Extra Deck: Negate the activation, and if you do, destroy that card, then you can declare 1 Attribute, and if you do that, for the rest of this turn all face-up monsters your opponent controls become that Attribute. You can only activate 1 "Magikey Unlocking" per turn.
![Magikey Unlocking [DAMA-EN073] Common | Arkham Games and Comics](http://arkhamgamesandcomics.com/cdn/shop/products/e4aa855a021984d12cd9df4bdf765db194327196_c199f29a-bb3f-4d4a-a5a2-cb1925e0563c.jpg?v=1706305188)
