To me, a r/g deck with a slash of black for Eviscerate and Vicious Offering, also maybe Soul Salvage, seems most appealing from this pool. You get lots of good early value, can create numerous saproling tokens, even make them bigger, and you have a game stealer in Sylvan Awakening. Losing the Serra Angel is tough, though, but white really hasn't going that much else for it, in my opinion. black is not deep enough, and blue feels lackluster.
Not a finished deck list (still need to take out 2 more cards), but further cuts hurt. I already removed Helm of the Host even though it can be very broken (had it do hilarious things in my prerelease) it takes a lot of time investment and this deck wants to go swinging, and Goblin Chainwhirler due to its prohibitive colored cost (it's simply not coming down consistently on turn 3 or 4 or even turn 5). I don't know if the finished deck would be better than yours, honestly. But that would have most likely been my deck in the prerelease from this pool.
Something like this perhaps
3 Swamp
7 Mountain
7 Forest
Creatures (17)
1 Bloodstone Goblin
1 Corrosive Ooze
1 Sporecrown Thallid
1 Untamed Kavu
2 Yavimaya Sapherd
2 Aesthir Glider
1 Ghitu Journeymage
1 Llanowar Envoy
1 Keldon Overseer
2 Keldon Raider
1 Spore Swarm
1 Rampaging Cyclops
1 Baloth Gorger
1 Mammoth Spider
1 Short Sword
1 Run Amok
1 Ancient Animus
1 Fungal Plots
1 Vicious Offering
1 Sylvan Awakening
1 Eviscerate
1 Shivan Fire
Not a finished deck list (still need to take out 2 more cards), but further cuts hurt. I already removed Helm of the Host even though it can be very broken (had it do hilarious things in my prerelease) it takes a lot of time investment and this deck wants to go swinging, and Goblin Chainwhirler due to its prohibitive colored cost (it's simply not coming down consistently on turn 3 or 4 or even turn 5). I don't know if the finished deck would be better than yours, honestly. But that would have most likely been my deck in the prerelease from this pool.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)