Couple things to help improve. Surrak, the hunt caller. Helps you keep swinging in on curve by giving your doods haste. Nissa's could become Blossoming Defence/Vines of wastewood. The ooze and forced adaptation are enough counter generation for the amount of bioshift you're playing. Also, your sideboard as listed isn't a sideboard (unless that's what you meant to put), a sideboard is a list of cards used to help sure up specific matchups. Like playing Display of Dominance against control, or Thragtusk for burn/aggro matchups, Natural state/Unravel the Aether for artifact enchantment hate etc
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Don't Mardu this at home
But does it Jund?
Considered flame slash or Mizzium mortars to make use of hypersonic dragon ability?
I would definitely play Dark Petition. I lost to a BUG variant of this (just the tree and triskadec however you spell it) and he put the enchantment into play, tutored for the tree and I just there hoping my draw was Declaration in stone or Nahiri.
Well filter lands are an option. I know fetid heath is the BW BB WW one.
Tapping a creature for mana doesn't get placed on the stack so isn't really an ability, it's treated the same way a land taps for mana. (as far as im aware.)
Hangerback walker to be sacrificed the the butcher