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You know, I think your opponent just doesn't know how to play Necropolis...
Seriously though: I believe that two duelists, one of whom plays Haven perfectly, and the other plays Necropolis, will inevitably end the match with the first one winning.
P.S. I won't be surprised if people start providing arguments to refute this. They might even be very well-reasoned. But I'm warning you in advance: they won't affect me. :D