You cannot fuse 3 Red-Eyes. However, if you have a Red-Eyes on your field and a Red-Eyes Darkness in your hand, you can summon that instead by tributing the Red-Eyes on your field. Each Red-Eyes Darkness gets +300 attack for each dragon-type monster in your graveyard. It starts out with the same attack/defense of a regular Red-Eyes, but if you run a dragon deck and you have 10 monsters in your graveyard (including the Red-Eyes you have to sacrifice to summon it), then you have a monster with more than 5000 attack, which could beat a Blue Eyes Ultimate, and it requires no fusion.
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he has black eyes
Well it all depends on what you feel is best. Blue Eyes White Dragon is good for beat-down and simultaneous fusion summons of both F.G.D. and Blue Eyes Ultimate dragon, pretty much beat-down itself. Red Eyes Black Dragons are more complicated, because it depends on which Red Eye compilations you are using or generally like. A different approach from this is Blue Eyes White Dragon is a better card if you want to compare it to the normal Red Eyes Black Dragon. Blue Eyes White Dragon is searchable with White Stone of Legend. Combined this with Card of Consance which discards a dragon tuner, (the White Stone of Legend), you get to draw 2 cards. And now with Trade-in (Level 8), you can discard that Blue Eyes White Dragon for another 2 cards. The normal Red Eyes Black Dragon is not worth playing anymore. If you want to have a good dragon deck with a good drawing engine, use Blue Eyes White Dragon, and The White Stone of Legend.
There are eight different "Red-Eyes" Monsters. Here is a list of them:"Red-Eyes B. Dragon""Red-Eyes Black Metal Dragon""Red-Eyes Darkness Dragon""Red-Eyes Darkness Metal Dragon""Red-Eyes B. Chick""Red-Eyes Wvyern""Red-Eyes Zombie Dragon""B. Skull Dragon" (Summoned Skull & 'Red-Eyes')
There are no such fusion card which Blue Eyes White Dragon + Red Eyes Black Dragon. So if you have both in your hand, Polymerization will not activate.
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