Hoo boy was this a lot of fun (pain) to make. I did the V-UNION blank from scratch, and I feel okay about it. I might have done some of the cool wall breaking effects, but I was worn out enough as it was making the blank (I'll have the PSD out sometime this month). Maybe next time. Onto the submission!
Pokémon V-UNION present a very interesting design space, and fulfill the requirements of this CaC from mechanics alone, as well as the ubiquitous Union Gain attack, which fetches 2 basic Energy cards from the discard. Picking a Dragon-type meant I had to choose if I was just fetching 1 or both of the Energy types which power it up. I ended up picking to grab just [M], as its Neuroforce Ability fetches [P] Energy, and I didn't want the [M] cost to be left out.
As tempting as it was to go all out with attacks and Abilities, I chose to keep the standard four (but I can imagine a fun card with 12), and give it 2 Abilities, sliding in between Mewtwo and Greninja. I wanted to fulfill the CaC requirements outside of the V-UNION mechanic, and I liked the idea of Ultra Necrozma V-UNION being a late game attacker, and both its Abilities function toward that. Neuroforce benefits from sitting on the Bench while your first couple attackers go down to build up its big attacks, and Ultra Brilliance pays homage to all the Ultra Beast Prize card interactions while giving it a significant powerup, especially for its Searing Prism attack, inspired by the properties of light-splitting prisms, which Necrozma is based on. Light of End is the finisher attack, and I split the difference between Mewtwo and Zacian for its effect and damage, as I wanted a drawback, and if this attack truly is the last of Necrozma's light (signified by its Psychic typing), then all of it should be gone. Photon Trail is Necrozma munching on all the light it can, drawing a card for each Pokémon of the same type on the opponent's Bench that matches the Active.
Overall, I'm quite happy with how this turned out. Using the old star holofoil gave the relatively simple artwork from Salanchu a great sparkle, and I like to imagine that all of those glittering lights are the remnants of stars Necrozma has eaten.