how to tell the value of yugioh cards Discovering Hidden in Old Yu-Gi-Oh Rare Value | Yu-Gi-Oh! Wiki

While they don't appear to have any specific mechanics tied to them, the cards can likely be included in any deck that's made of one of the card's two ink colors

The Mewtwo ex card depicts a very different atmosphere

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It's a Trap Raigeki (most of the time, your opponent's monsters won't have an A-Counter until your turn unless you have Kid or recently played PPV) and generates free counters on everything your opponent Summons, which is nice for turning Telepath into MST or even a sudden Brainwashing Beam, though Beam is kinda situational

This leaves Beseech the Queen as a (mostly) unconditional tutor for any color, which is potentially very scary indeed

Valor Valor is one from the Judgment cycle, which give your creatures an ability while in the graveyard