Will there be any conflict in believing in Buddhist tarot cards?

No, you should know that there is no opposition in Buddhism. It's not that Buddhism is antagonistic. Since there is no objection, it doesn't matter to play tarot cards. Some people say that we are not allowed to play. For some students who have just started to learn Buddhism, if they have evil thoughts about Jaken, they are not allowed to do anything. But if they learn Buddhism to a certain extent, they will be really comfortable.