Fun fact about Red-Eyes Zombie Dragon

Ritual Foregone

Fun fact, Red-Eyes Zombie Dragon is Actually a Zombie Counterpart to Red-Eyes Darkness Dragon, not Red-Eyes B. Dragon

This might seem a bit weird, but it's actually true if you look closely. Zombie Dragon has red markings all over its bodies, and if you look at Darkness Dragon it also has similar markings all over its bodies. In addition, Darkness Dragon had 5 red gems on its bodies, and if you look closely, Zombie Dragon has patches of blue fire in the exact same position as those gems. The wing shape of Zombie Dragon is much more close to that of Darkness Dragon than Red-Eyes B. Dragon as well. Finally, and this is what clinches it for me, Zombie Dragon and Darkness Dragon both have spikes that run down their tails, while Red-Eyes B. Dragon does not.

One other similarity I noted between them was the fact that Darkness Dragon Special Summons itself from the hand by tributing 1 "Red-Eyes B. Dragon", while "Red-Eyes Zonbie Dragon" can be normal summoned with only 1 Tribute of a Zombie monster.

Lastly, to put all doubt to rest about this. People have noted that Structure Deck nowadays make reference to older structure decks. This one coming out rigt now references the original Zombie World structure deck. Well that structure deck actually referenced the first two original Structure Decks that came out side by side, Dragon's Roar and Zombie Madness. The cover card for Dragon's Roar was Red-Eyes Darkness Dragon, so they used its design but with the zombie aesthetic.