I've updated my Simic Synergy list:
GameplanRamp, draw cards, play fatties, smash.
CardsElvish Visionary early play and card draw to combo with Chasm Skulker, extra body for Mycoloth/Craterhoof.
Brackwater Elemental enables Prey Upon and triggers Garruk's Packleader a lot.
Chasm Skulker grows very quickly and can be sacced to Mycoloth for dudes.
Master of Waves pumps elementals, gets devotion from the Dragons and provides bodies for Mycoloth/Craterhoof.
Mold Shambler artifact/enchantment removal that triggers Packleaders.
Phantasmal Dragon big flier that triggers Packleaders and gives a lot of blue devotion.
Arbor Colossus big dude that eats Baneslayers for breakfast.
Garruk's Packleader is the centerpiece of the deck, draws a lot of cards.
Mycoloth can win games by itself if undisturbed, has lots of fodder like Brackwater Elementals after they have attacked.
Terra Stomper to fight against opposing Pelakka Wurms.
Pelakka Wurm for some lifegain and to smash face.
Craterhoof Behemoth for when you're all out of gum.
Prey Upon cheap green removal, supported by our fatties.
Vapor Snag against those silly aura decks.
Think Twice extra 2-drop and who doesn't like drawing cards.
Cultivate so we get to cast our fatties, lots of 5-drops to curve into.
NOTE Don't try to use Prey Upon with Phantasmal Dragon, the only nonbo in the deck.Other cards I considered:
Nylea's Disciple,
Triumph of Ferocity,
Mercurial Pretender,
Soul of Zendikar,
Satyr Wayfinder.
I could see playing Disciple over the Dragons, but then Master of Waves loses some value and we lack fliers for those token board stalls.