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Why are you so fixated on summoning? I don't even use it, except when there's nothing else to do on a given turn...
And in a tournament, in the first round, I beat Necromancers with Demons on the "Interregnum" map, and once on the "Golden Brimstone" map. In both cases, both players played Necromancers well, but unfortunately, they didn't know the specifics of their opponent's race.