I disagree with your recent land changes. The problem with lands like
Kazandu Refuge is, that they slow you down. with 2 colors colorfixing shouldn't be a problem. And if you're really afraid of it, what about
Command Tower and
Exotic Orchard? Both can help with colorfixing and still fit into your budget.
For a little more draw,
Drumhunter,
Abzan Beastmaster and
Fauna Shaman (maybe out of your budget) could come handy. I think you could also cut 2-3 lands for them without harming your mana base.
Btw, if you need some graveyard hate,
Scavenger Grounds could come handy.
Sunder Shaman could be interesting for your removal section.
If you like combat tricks, what about
Tempting Licid? if used right you could remove some nasty creatures for just GG (e.g force all creatures of opponent a to block an attacking creature of opponent b).