Fusion Summon 1 Fusion Monster that lists a "Red-Eyes" monster as Material from your Extra Deck, using monsters from your hand, Deck, or your side of the field as Fusion Materials, and if you do, its name becomes "Red-Eyes B. Dragon". You cannot Normal or Special Summon other monsters the turn you activate this card. You can only activate 1 "Red-Eyes Fusion" per turn.
Neos Fusion is similar in that it allows you to Fusion Summon using monsters from the deck as materials. With the right Fusion Monster, this can be used to pitch a monster of your choosing out of your deck. The difference is that Neos Fusion lets you Special Summon during the turn before activating Neos Fusion and you are still allowed to Normal Summon throughout the turn.
Red-Eyes Fusion does not allow you to summon at all the turn you activate it. They both also provide support in their secondary effects relevant to their own archetype.
Future Fusion is the most generic card for the purpose of pitching monsters out of the deck to use as Fusion materials.
Here are some Fusion Monsters you can summon with Red-Eyes Fusion. Choosing to summon Red-Eyes Slash Dragon lets you pitch any Warrior-type monster you want into the graveyard. B. Skull Dragon and Meteor B. Dragon will need the name change provided by Red-Eyes Fusion to benefit from Red-Eyes support.
Sends from your hand to your Graveyard / Sends from your field to your Graveyard / Sends from your Deck to your Graveyard / Fuses Materials from your hand / Fuses Materials from your Deck / Fuses Materials from your field
Fusion Summons / Special Summons from your Extra Deck / Prevents your Normal Summons / Prevents your Special Summons
No such thing... yet. Dragon’s Mirror is the best they got so far
Amusingly, RE Retro, is SR AND is the cover card.
With the exception of Neos deck where Neos Alius is listed before Brave Neos for some reason (although both are UR anyway), they always put the cover card as the first card of the deck, and it is always listed based on rarity.
.....Which means, there's probably nothing beyond SR in this deck.
Putting an SR as cover card when there's an UR in the deck also kinda makes no sense.
Which in turn brings me to the point I want to say:
The only RE fusion we have in the game that's not UR, is Black Skull Dragon, a.k.a. the weakest RE fusion monster we have. That alongside the vanilla Summoned Skull is probably what we're going to get in this deck, because komoney says "FU as usual".
New cards in a Structure Deck being UR or not makes absolutely no difference. (Actually, the one difference it does make actually means being UR is preferable. Looking at the tickets we're getting for the WCS celebration, we're not getting a Dream SR Ticket, so Dream UR tickets are more "common", lol).
Meteor B. Dragon seems a likely inclusion here just to avoid including Summoned Skull.