Commission - Valiant Characters among greatest super-heroes by Anthony Castrillo

I have no idea what this was commissioned for. The artist only says that it was done quickly without any prelims for a Valiant fan project and a good cause. It doesn't matter, because its awesome!

The image is of the Valiant characters (not all drawn perfectly but we can overlook that): Archer, Armstrong, X-O Manowar, Solar: Man of the Atom, Magnus Robot Fighter, Shadowman, Bloodshot, Eternal Warrior, Solar the Destroyer, Turok, the Harbinger kids and even a spider alien hanging out with the great comic book characters of all time. I'm not going to be able to name them all but I'll try: Superman, Batman, Hulk, Captain America, Wolverine, Cyclops, Spider-man, Vampirilla, Nightwing, Joker, Ant-man, Mr. Fantastic, The Thing, Bone, Doctor Doom, Silver Surfer, Thor, Mickey Mouse (?)...

If anyone has any idea what this was used for please let me know.