Hi,
I see some amount of cloning/stealing effects. My first advise is not to copy you're general's abilities, but rather to support them.
For instance, once you've stolen a creature with Rubinia, you could sacrifice it for value with
Birthing Pod or
Evolutionary Leap.
If you decide to go wide with enchantments, you could add some enchantresses (
Argothian Enchantress,
Enchantress's Presence,
Eidolon of Blossoms,
Satyr Enchanter...).
With
Bant colors, I always put a Loam package:
Life from the Loam,
Land Tax,
Trade Routes, some cycling lands, bouncelands, fecthlands etc...
You could even go deep into cycling theme, adding
Astral Slide and
Eternal Witness to the bunch.
It depends on what direction you want to pick, cards you may want to add will vary a lot.