Color Magic fits perfectly in a GB Color, but a bit snuggly in a GBA SP. I’m not sure if the Action Replay for GBA allows for screen captures but if so then it would be useful with this card and a gameboy camera. It breathes new life into old classics like pokemon yellow, bubble bobble, gremlins, GBC … hell anything. The Color Magic Card II says right on the front of the box that this card will increase the colors and the fun and it does just that! The card really shines with 12 color variations to boost the limited color pallate of original Game Boy games. I’ll prolly get one for the whole family.
I got them both new off ebay for about $5 each. Here’s a Game Boy Color Magic Card II by Y2K and a Game Boy Color Mega Memory Card by Interact.