I would suggest making space for more lands & ramp in particular. Prava is a decent mana sink, and you have access to basically 2 "extra" cards in your hand, so it is very difficult to have more mana than you can use.
38 lands and 8-10 pieces of ramp is probably a good baseline.
Exotic Orchard,
Llanowar Wastes,
Caves of Koilos, and
Canopy Vista are all really good multicolored lands that enter untapped and cost ≤$1.
Selesnya Signet,
Avacyn's Pilgrim, and
Elves of Deep Shadow are cheap both $ wise and mana wise and can fix your mana.
You mentioned needing card draw, so here are a few options:
Idol of Oblivion can consistently draw cards with Prava's activated ability,
Camaraderie is nice synergy with tokens and lifegain,
Abzan Beastmaster is spicy tech with Prava's toughness pump/Ikra's high toughness,
Mentor of the Meek is nice with tokens, and then
Harmonize,
Night's Whisper, and
Read the Bones are good, consistent options.
I would suggest cutting some of your more expensive cards, like
Belligerent Brontodon,
Requiem Angel, or
Rampaging Baloths.
Hope I gave you some ideas!