Cactus Web Site special offer: Orders over $75 will receive a free Angel of God 2023 National Promo card while supplies last.
The only card idea that I am aware of that has ever become a real card is Windows of Narrow Light, who I cannot remember the author of (It might have been Kirk, but I'm probably wrong).Other than that, there isn't really a way to submit an idea. Unless of course, they notice you.