I think dive and skyblitz both cancel out antimatter. There's the doubled negative attack for one turn, but then the creature returns to the pre-anti mattered state. In other words, it is normal again. I can't vouch for it right now, but I had the idea it happened to both dragons and wyrms. If that is correct it's a universal effect.
And I figured I'd test it to be sure. Strangest thing: No effect at all. If it is a bug, it is not consistent, but I know I saw something weird. Will edit, if I find it.