Key Cards/Interactions
Scry + Draw: Not much explaination need here. Scry + extra draw power can give you what yo uwant/need much sooner. Fathom Mage is a particularly interesting interation (at least to me) because you get an extra creature in addition to the draw
Zameck Guildmage + Monstrosity: Zameck Guildmage is already good at setting other creatures up to draw using both of his abilities, but Monstrosity makes it easier on your mana (6UU at any time instead of GGGGUUUU + 4UU on your own turn) and has other effects (though there are only two different creatures in here atm, with Shipbreaker Kraken being the more influential of the two)
Urban Evolution and Prime Speaker Zegana: Refills your hand easily. the former helps accelerate your mana while the latter provides +1/+1 fodder for Zameck Guildmage or Bioshift
Crowned Ceratok + Monstrosity: Shipbreaker Kraken now has trample. that is all.
Inaction Injunction: Good for tempo early game that replaces itself
Bioshift + monstrosity: Good for combat tricks, but it's less useful and I'll probably be replacing this
Voyaging Satyr + Simic Guildgate: Untaps your gates to help accelerate
voyage's end + Monstrosity or Prime Speaker Zegana: You can redo Monstrosity! Only with Shipbreaker Kraken, the creatures you tapped will be able to untap again. Main point of this is to replenish +1/+1 counters once you use them up on the monsters and/or Zegana.

Current Sideboard choices
Fade into Antiquity and Naturalize
People WILL be using the Gods and weapons.

Aetherize and Essence Scatter
Against aggro, though the latter will be meo for the bigger threats

Dispel
Against spell-oriented decks like Young Pyromancer decks.

What this deck needs
>Better Protection
More specifically, more Simic Charms and more Voyage's End. Two Spell Ruptures is a good number because they're wonderful if you have creatures on board, but that's just it: you need creatures as early as possible, so if you draw any of these when you ned creatures, you're screwed.

>Another Shipbreaker Kraken
I would rather have two of these (or even three!) than Sealock Monster, but i've only got one right now

>Better acceleration
Urban Evolution is good in this deck and is staying, but some Elvish Mystics would really help.

>Ordeal of Thassa/Nylea
More +1/+1 counters that do things even if you sacrifice them early. the latter helps with acceleration, and this in general will also help Drakewing Krasis have more staying power

>Ways to deal with things on-board/Removal
4 bounce spells will not be enough. Need Pit Fights (might replace the two bioshifts) and i can easily get them

Considerations
Simic Fluxmage: The ability to spread +1/+1 counters will help Drakewing Krasis, which i always find to be an important attacker before anything else becomes battle-ready (be it evolve creatures or Monstrosities i can't cast just yet)
Curse of the Swine: A board wipe of sorts.
Centaur Battlemaster + Heroic stuff: Again,more +1/+1 stuff, but I'm afraid adding Heroic will mess up the focus
Horizon Chimera: I've been wanting this card since it was spoiled. an extra flier + lifegain-draw will really help.
Prophet of Kruphix: Now sure about this one, actually, but resetting your creatures and lands could prove to be useful
Nimbus Naiad: Giving things flying will surely help
Nylea's Disciple: Lifegain is weird when white or black aren't involved, but i've got plenty of Green in this deck and could make a nice little cushion right off the bat, especially in multiples (compared to Horizon Chimera, but i'm really moer interested in the 3/2 flying trample flash part)

Got more Moola?
Bow of nylea: So many options on one stick! +Deathtouch.
Thassa, God of the Sea: Scry 1 + Unblockable every turn!
Nylea, God of the Hunt: Trample + Savage Surge on a stick sounds like a good idea.
Aetherling: I think the article that featured him said he was meant for midrange/control decks