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Like how Yugi's Dark Magician is all the more powerful in his deck thanks to the various Spell, Trap, and Monster Cards that can support and strengthen it, Red-Eyes Black Dragon has a similar place in Joey's deck

A card with a tiny whitening on the corner, a slight scratch on the foil, or a centering issue can drop from PSA 10 to PSA 8, cutting the value in half

Actually, there was one really unfortunate example It was called Lysandre's Trump Card. People came up with a way to really exploit that card, to ruin the game and make it take a very long time

Therefore, you cannot use the mutate abilities of creatures you already have in play