Just got done making this since I'm getting back into YGO and yes, it's a CB again. Ikr? How original; wishing CBs weren't trash and had actual good support. This one's entire goal is to help CBs have even faster speed. Found the background and monster images from online so they're not mine, just an FYI.
The best word to describe Diamond Snake is Versatility. You can do an absolute crap ton of stuff with it. You could absolutely just summon it and get the CB Deck or GY search, but you could also use Pegasus into Snake (S&T Zone), banish into another Diamond Snake Special Summon, use its effect to get a Rainbow Dragon into your hand, attack with a CB (Snake if you're feeling daring), Special Summon Rainbow Dragon, repeat Snake banish into the third Diamond Snake and get yet another Rainbow Dragon, attack with first Rainbow Dragon and summon a second Rainbow Dragon.
Yeah, you're not friggin' laughing at CBs anymore, are ya? That's what I thought. Oh, and look at that; you've got a whole bunch of CBs on the field already! Better get to them CB S&T Zone shenanigans! :D