This is the final card I did not post.

>Scar-Red Nova Dragon/Buster / Red Nova Dragon/Assault Mode
>DARK Dragon / Special Summon / Effect
>LV 12 4000/3500
>Cannot be Normal Summoned/Set. Must be Special Summoned with “Assault Mode Activate”.
>(1) When your opponent activates a card or effect (Quick Effect): You can banish this card until the End Phase; banish cards your opponent controls up to the number of Tuners in your GY.
>(2) When an opponent’s monster declares an attack: You can banish this card until the End Phase; negate the attack, then end the Battle Phase.
>(3) If this card is destroyed: You can Special Summon 1 “Red Nova Dragon” from your GY.

This is probably the only card that won't be played, because it requires specifically playing Assault Modes to make use of it (all its effect require it to be/have been on the field), AND to play Red Nova Dragon (which is already not played and hard to summon).
It's got a busted effect like Red Supernova Dragon's but it can be activated at almost any point, and there might be easier ways to summon Red Nova Dragon with the new support, so who knows.
Interesting that it's a main deck level 12, those are rare.