Dat Evolve Doe.
--- CREATURES ---
Elusive Krasis: Well, card is self explainatory. For 3 mana you get a 0/4 evolving unblockable little fishy that can get a huge whale.
Experiment One: Very nice turn 1 drop, it will get huge in some turns, and it has a good regenerating ability.
Gyre Sage: ITS RAINING MANA, HALLELUJAH ITS RAINING MANA, HEY MAN!
Prime Speaker Zegana: That babe is such a beastly card! She get lots of +1/+1 possibly and you also draw cards! Only bad thing is the mana cost :(
Prophet of Kruphix: The theros star. Just read the ability and prepare to get countered and/or blocked almost every turn :)
Renegade Krasis: Love it, everytime it can trigger your creatures evolve ability TWO TIMES
Shambleshark: Pretty nice 2/1 that can evolve easly :) btw, love the artwork.
--- OTHER SPELLS ---
Biomass Mutation: This is the situation: You got 2 Elusive Krasis on the board, you drop it, making them become 5/5 or even more (hello Gyre Sage). PROFIT!
Frost Breath: Tapping creatures to swing for 2 turns.
Rapid Hybridization: Amazing card, if your opponent has some fatties on the battlefield, just turn them to 3/3s! :D
Simic Charm: Best charm after Boros Charm imo, it can help you to swing for some more damage (or win some battles), save your creatures from mass removals and clear the board.
Spell Rupture: Nice counter, if you're running Simic, probably your opponent won't have enough mana to use.