WJoshua.

Name: Wonder Fusion
Trap type: Normal
Effect:
Immediately after this effect resolves,Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from your hand or your side of the field as Fusion Materials.

Because its been two days. Totally didn't make this a different version of Wonder Xyz nope.

Name: W Nebula Fusion
Card Type: Normal Spell
Effect: Fusion Summon 1 "Worm" Fusion Monster from your Extra Deck, by banishing Fusion Materials listed on it from your side of the field or your Graveyard.
If this card is in your Graveyard: Banish it and target one face-up monster on the field; Set it in face-down Defense Position. This effect cannot be activated the turn this card is sent to the Graveyard.

Name: Unrelenting Knight Parshath
Level: 6
Attribute: LIGHT
Monster Type(s): Fairy / Synchro
Effect: 1 LIGHT Tuner + 1 or more non-Tuner monsters
This card cannot be destroyed by battle. When this card attacks an opponent's monster, that monster's ATK and DEF become this monster's DEF until the end of the Damage Step, but it cannot be destroyed by that battle. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent.
ATK/DEF: 2000/1600

Name: Zarathustra, The Ruin Dragon
Level: LV 7
Attribute: LIGHT
Monster Type(s): Dragon
Effect: Eclipse Wyvern + Twin-Headed Behemoth
This card cannot be Special Summoned except by Fusion Summon using the listed fusion material monsters. When the effect of a Monster Card except this one card would be activated while this card is face-up on the field, reduce this card's ATK by 500 to negate the activation of that Monster Card and destroy it. During your End Phase, you can discard one Monster Card from your hand to change this card's ATK to it's original ATK.
ATK/DEF: 2600/2000

@Ammokkx

Realized another problem with Tanto the Sleet. Assault Blackwings all have the effect of being treated as Tuners despite being non-Tuners if a condition is fulfilled. So I'm going to suggest this effect, which I think will keep with the spirit of the card and also the archetype as a whole.

Name: Assault Blackwing - Tanto the Sleet
Level/rank: 1
Attribute: DARK
Monster Type(s): Winged-Beast/Effect
Effect: If you control a "Blackwing" monster other than "Assault Blackwing - Tanto the Sleet", you can Special Summon this card (from your hand). If Summoned this way, this card is treated as a Tuner monster. You can banish this card and any number of "Blackwing" monsters from your Graveyard, including at least one Tuner monster; Special Summon one "Blackwing" Synchro monster from your Extra Deck whose Level equals the total Level of the banished monsters. (This Special Summon is treated as a Synchro Summon.) The monster Summoned by this effect is returned to the Extra Deck during the End Phase of this turn. You can only activate the effect of "Assault Blackwing - Tanto the Sleet" once per turn.
ATK/DEF: 0/800

<Snipped quote by LunarStandard>

Fergot to address this. I'm going to reject this rehash of Tanto, honestly. At this point, whilst keeping with the spirit of the card, it isn't what the card was supposed to be. At this point, we're veering away from the 'Retrain of Vayu' territory and into the 'Creating a new card' one. Considering you're extremely bent on keeping the spirit of the Assault Blackwings intact, or something of the like, Tanto will now be called 'Blackwing - Tanto the Cold Gust'

<Snipped quote by Ammokkx>

I don't mind, except for the fact that if it's a normal Blackwing, you might want to follow the manga nomenclature. Something like "Spatha the Full Moon".

Name: Unrelenting Knight Parshath
Level: 6
Attribute: LIGHT
Monster Type(s): Fairy / Synchro
Effect: 1 LIGHT Tuner + 1 or more non-Tuner monsters
This card cannot be destroyed by battle. When this card attacks an opponent's monster, that monster's ATK and DEF become this monster's DEF until the end of the Damage Step, but it cannot be destroyed by that battle. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent.
ATK/DEF: 2000/1600

@Scarifar

Clarify its effect to me cause currently the way its effect is used makes no sense. ATTACKS gains DEF until the end of the damage step. Like what even. If its being the aggressor shouldn't it be gaining attack as well?

Seems alright to me. It cannot kill monsters and, outside of ATK boosts, will always deal 400 damage per attack.

If anything, it seems pretty tame.

Well @Ammokkx, how's about that decision on the card?