how to tell the value of yugioh cards Discovering Hidden in Old Yu-Gi-Oh Yugioh Card Value Guide: Selling

Great value at $42

Red-Eyes Darkness Metal Dragon has a respectable 2800 ATK/2400 DEF and is easy to special summon, only requiring you to banish 1 Dragon monster you control

Remove from play a number of card(s) in your Graveyard equal to the number of counters on this card to destroy that same number of Spell or Trap Card(s) on the field

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

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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