But, I mean... I'd like to pilot more than one deck, too lol. Even if the character won't die, it's not as if there's any harm in having more than one, right?

And... Well, while that does answer my question, the problem is more in regards to how you said that if it was a Ritual, we need a corresponding Spell to summon it. But y'know, Kaleidoscope, Mirror, and Cycle can pull out all the Nekroz, so I was wondering how that works in the end and in regards to the rules you've set forth thus far.