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It's quite good alongside other graveyard answers in these colors

While it is possible to synergize with these effects, the value that The Darkness Crystal provides is more based on your opponents deck than your own

But after answering thousands of these questions, we've noticed some clear patterns

Theres a lot of potential here if you can pose somewhat ambiguously, but its not going to be as useful if you dont have some dedicated followers

"Number F0: Utopic Future", "Number F0: Utopic Future Slash", "Number S0: Utopic ZEXAL", and "Number F0: Utopic Draco Future" are currently the only Xyz Monsters that do not have a printed Rank (although they are always treated as Rank 1)