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Secondly, one of the problems that Heartless Summoning decks have is that they aren't very good when they don't have it. Consider adding recursion like Noxious Revival, protection like Heroic Intervention or more low-cost creatures so that you can win without Heartless Summoning effects. You can do most of this in the sideboard if you create one but you should main deck some of the prior effects
As I said, this is a great deck and I hope you keep working on it