I would continue the series as an anime or video game I didn't understand why each group of cards doesn't combine with the other 9 and some cards should be changed because they seem repetitive to me I'll give an example with the unique Ancient group which combines with almost all groups except Vehicle, Fantasy and Cosmic, so 3 combinations would have to be modified I also don't understand why there are two prehistoric fish, instead of a fifth dinosaur Furthermore, 3 new Riders could debut, for the following reason: Gotchard combines with all Chemy and its basic form comes from 1 and 9 Majade 3 and 7 Cosmic Fantasy Valvarad 4 and 4 Occult Vehicle Missing 2 and 8, 4 and 4 and 5 and 5, see which of the two options he would use, with 2 groups each among the remaining 6 types Plant does not combine with Job and Insect A pirate with a prehistoric fish or energy drink would be cool
