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Flare Metal Dragon does have one effect that works with Red-Eyes decks specifically

If this card is detached from an Xyz Monster and sent to the GY to activate that monster's effect: You can target 1 card your opponent controls

Mega Blaziken EX and Mega Gyarados EX may be stronger on paper, but with time, strong players get used to countering those decks

Simply put, its easy for collectors/lay buyers to accurately price a single card given the sources mentioned earlier (TCGplayer, eBay, PSA, etc.)

As for the decklist itself, let's take a look and see just what kind of shenanigans we can get into

It gives us Monarch, and then punishes anyone who attacks you by dealing damage equal to the number of cards in their hand