You don't really need card draw in a deck like that. There is tons of value, and usually every card draw I get from hagatha is horrible and impossible to use. Most of the time I have hand-size issues and can't even play Alex.
I don't feel like you need any aoe in a midrange deck like this one, but a few cards act as aoe here : Zephrys, both Hagathas, Lightning Breath, even Twin Tyrants. If you really feel like you need more than that you can add Scheme and Earthquake. But you gotta keep in mind : this is not a control deck. You wanna take control of the board, not keep on clearing it.
Maybe that's where your lack of success came from, playing it as a control deck when it's not. For me the results are good !