To make the deck a bit more playable, you need to improve your mana base.
You probably want a bit more land. I usually run 33 or 34 in a two-color deck with green. You generally don't want lands that enter tapped (like
Foul Orchard). But if that's all you have for dual lands, then one is ok-ish.
Command Tower is almost a must.
Rogue's Passage could be beneficial, as you want to get Hapatra dealing damage.
Then you want about 8 pieces of ramp. I only counted 3 in your deck. Green is the best ramp color. You want to use things like:
Sol RingGolgari SignetFellwar StoneRampant GrowthCultivateKodama's ReachLlanowar ElvesBirds of ParadiseOnce you've got a good mana base, then you can play just about any card you want to put in your deck. Hope this helps.