Hi there.
Here are my suggestion on a good Simic deck. I personally loves this deck. People get "woow is that even possible" when i stack up my manipulator, biomancers or thragtusk. Following is a bit on why i added each card:
Arbor elf: Get fast to drop 4.
Farseek: Get fast to drop 4
Simic Manipulator: Stacks up pretty easy. Takes over one of the opponents main creatures.
Master Biomancer: Obvious choice. Stacks up the rest of your party of creatures. Get two down or three to stack up each Biomancers.
Fathom Mage: Drawing power. Easy to stack up.
Prime Speaker Zegana: Lots of fun tricks to do with this fellow. Including drawing power and triggering evolve
Thragtusk: Obvious choice. 5 life, trigger evolve, if it dies, triggering evolve again, your perfect choice for Rancor.
Increasing savagery: 5 counters. Free placement. That's beautiful.
Simic Charm: Buff Biomancer or whatever. Buff biomancer before another biomancer enters the battlefield. Also slow down opponent early game (take creatures of the table)
Garruk, Primal Hunter: Stack 3/3 tokens to trigger evolve. Drawpower or end the game by flooding the battlefield with 6/6's
.
Mystic Genesis: Counter spell with an Ooze in addition. this two cards could be anything really. Ooze flux, Bio shift, Sapphire Drake or what ever.
The side board is pretty obvious.
What i am looking for now, is a way to replace Thragtusk, since many new players will get troubles getting hands on that sweet baby.
More description is coming later.