* Make room for 4x Sylvan Caryatid (remove a couple lands, gyre sages).

+Black sideboard:
  Add Overgrown Tombs and Golgari Charm for regenerate all creatures against board wipes.

Cards for Consideration

Creatures
  Vorel of the Hull Clade - doubles counters on a creature
  Progenitor Mimic - copy Master Biomancer and get another copy each turn
  Prime Speaker Zegana - card draw

Counterspells
  Stymied Hopes instead of Spell Rupture - Only requires 1 mana from opponent, but has scry.
  Too expensive - Plasm Capture - GGUU - adds spell's cmc as any color(s) to mana pool next turn

Artifacts
  Strionic Resonator - double the counters added to each creature by Renegade Krasis