I tested a quite similar deck with 4 Dust Stalker4 Hangarback Walker2 Drana, Liberator of MalakirAnd overall 4 Ghostfire Blade.All those cards could easily remplace some less efficient. Ghostfireblade make this deck able to be call "Aggro"
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If i put 4 sphinx's tutelage, i would only put 1 Browbeat (that's the second unco). Yes counter of discard is should be hard. The sideboard should make it easier. The meta, where i play, is not really with that much discard. I will test it only to see how it goes.