"Red-Eyes Flare Metal Dragon" Rating Score by プンプン丸

Futsushii...
There are 3 effects: destruction resistance, burn, and expansion.　
Even as a general-purpose card, it is resistant to destruction, and can stay on the field for a certain amount of time, but it may be removed by bounces, etc., so overconfidence is prohibited.
At first glance, Burn seems to be plain at 500, but these days it's an era where monster effects and spell searches are fired in rapid succession, so it's quite a bit of damage. For example: 《Tin Goldfish》(500) → Shadow Mist (500) → Castel (500) This alone will do 1500 damage. "At least 500 will fit without this." I think that categories like Igknight and Madou that search a lot, as well as categories that spin around on my turn, will take a lot of burn damage.
In addition, the effect of ③ is a free chain, so even if your opponent tries to deal with this card with general rank 4 such as Castel, 101, etc., it is an excellent one that leaves Red-Eyes on the field.
Overall, I think it's a relatively easy card to use.
As a joke, if 《Demon King Dragon Beelze》is on the opponent's field, a loop will occur and it is possible to reduce his LP to 0. "It's just an infinite loop!" It might be worth sending Beelze with 《Creature Swap》to aim for it.