So I play with cerulean nephthys cards and off and on while I'm doing KC cup duels I'll not be able to use my ritual spell card even though I have all the required cards on the field or in the hand to perform the summon. I'm wondering if Its some sort of cheating? I'm not sure how you could do that but its getting really frustrating. And theres no monster effects/card effects/skills that are getting activated when this happens. It'll just be my turn and I can't activate my cards even though I should be able to. Does anyone know what That's all about?
the only thing i could think of is that you may be using a skill which prevents you from doing a ritual summon. there are also some ritual cards where you must have the EXACT level of monster(s)
It happens with spell cards sometimes, I often can't use cunning on occasion with six sam.