3 Forest
2 Mountain
3 Plains
4 Reflecting Pool
4 Fire-Lit Thicket
3 Wooded Bastion
3 Vivid Grove
3 Firespout
4 Lash Out
3 Oblivion Ring
4 Shield of the Oversoul
3 Oversoul of Dusk
4 Safehold Elite
4 Kitchen Finks
3 Wilt-Leaf Liege
4 Wilt-Leaf Cavaliers
4 Gaddock Teeg
3 Primal Command
SB: 4 Cloudthresher
SB: 1 Firespout
SB: 4 Wispmare
SB: 1 Oversoul of Dusk
SB: 1 Oblivion Ring
SB: 4 Chameleon Colossus

Notes:
Shield of the Oversoul is a great card, but if you used them to good effect in Game 1 and you suspect your opponent will side in Enchantment removal I’d take them out in Games 2 and 3 - give them an almost dead card. And the card is pretty bad against the Fae. In fact the whole deck has a dubious matchup against Faeries.
Overall I don’t think that the inclusion of 4x Lash Out and Firespout (paying Red) warrant the loss of consistency you’d get from GW. Were there honestly 4 Reveillarks just for Teeg (and Safehold Elite)? I’d maybe look at Black, giving you access to Shriekmaw and Inversion, Doran and Mannequin.

4 Reflecting Pool
5 Forest
6 Mountain
4 Fire-Lit Thicket
3 Mutavault
4 Impromptu Raid
3 Cream of the Crop
4 Firespout
3 Spitebellows
4 Fulminator Mage
4 Woodfall Primus
4 Deus of Calamity
4 Kitchen Finks
4 Farhaven Elf
4 Devoted Druid
SB: 3 Primal Command
SB: 2 Lash Out
SB: 1 Spitebellows
SB: 3 Spring Cleaning
SB: 3 Cloudthresher
SB: 3 Vexing Shusher

Round 4: Kithkin versus Faeries.
Faeries wins 2-1 (games 2 and 3).

Round 5: Kithkin (JW) vs. GB Elves (Me).
Game 1 sees Kithkin win with Mirrorweave and Spectral Procession. Wolf-Speaker Shaman is a match for Kithkin’s numbers, clogging up the ground
Elves SB for Game 2:
-4 Chameleon Colossus
-3 Garruk Wildspeaker
-2 Profane Command
+4 Thoughtseize
+1 Cloudthresher
+4 Shriekmaw
Game 2 Elves starts with double Swamp and no other lands.
Result: Kithkin wins 2-0.

Round 6: Kithkin (JW) vs Merfolk. Again.
Stuff happens. Like always. Sage’s Dousing can’t counter Cloudgoat Ranger if it’s played with a Windbrisk Heights. Merfolk has Reejerey+Mirrorweave, but can’t get past a Wizened Cenn, so Kithkin wins next turn with its own Mirrorweave on Wizened Cenn. Merfolk, having Sower’d a tapped Cloudgoat Ranger is one blocker short of wiping the board on both sides.
Merfolk mulls to 5 and prepares to lose. Merfolk gets a better start, but fails to Douse Kithkin’s turn 4 Wilt-Leaf Liege. Merfolk Mirrorweave shenanigans remove one Wilt-Leaf Liege, but another one hits the table to combo win on the next turn.

Round 7: Kithkin (JW) vs. GW Elves.
Game 1 is a walkover for Kithkin. Spectral Procession is a massive beating.
Game 2 GW puts up more fight, stalling the ground with Wilt-Leaf Liege, Heartmender, Wilt-Leaf Cavalier and Kitchen Finks. Once again Spectral Procession tokens knock off a lot of life with neither Cloudthresher nor Pollen Lullaby making an appearance, although Gaddock Teeg strands 2 Mirrorweaves, one under a Windbrisk Heights and the other in hand. 3 Mutavaults on one side of the board, and none on the other (aren’t even being played in GW Elves ) provide victory to the faux-tribe of manlands once again.
Result: Kithkin wins 2-0.

New Standings:
W Kithkin: 70% 14/20.
Gubw Mannequin: 67% 4/6.
GB Elves: 64% 7/11.
UB Faeries: 57% 4/7.
GW Elves: 50% 5/10.
RG Ramp: 50% 2/4.
Merfolk: 41% 7/17.

So, play Kithkin, or play something that beats it (Faeries, or TokenElves)?

Round 2: UW Merfolk versus Gubw Mannequin
Merfolk wins 2-1
(Wins round 3 via a lot of Adepts, Cryptic Commands and comboing off with Mirrorweave on a top-decked Meerrow Reejerey).

Round 3: UW Merfolk versus W Kithkin
Merfolk wins the roll and draws into a 1-lander with Mutavault.
Second hand is a 4-lander with Cursecatcher and Adept, and after some hesitation it’s shipped back.
Kithkin mulligans into Stalwart, Wizened Cenn and Knight of Meadowgrain. Probably GG right there.
Creatures are dropped, combat happens. UW Sygg hits the table, and a Surge of Thoughtweft is Douse’d. A lonely Sygg faces down Knight of Meadowgrain and Stalwart. Mutavault springs out to block a Stalwart, and Protection from White wins the round. A Wizened Cenn attacking allows a Mirrorweave to be flipped, but after it resolves a Mirrorweave from the Merfolk side of the table on a freshly activated Mutavault prevents a one-sided Wrath. Merfolk goes down to 8 and faces a Knight of Meadowgrain with an empty board. A new Sygg stalls for a while.
Gas from the Merfolk deck is met with Land for the Kithkin player, and the game stalls further, a Mirrorweave in hand for Kithkin cannot help penetrate the barrier of expendable Merfolk blockers. Cryptic Command hits Cloudgoat Ranger, and Reejerey and Sower of Temptation add insult to injury.
Merfolk wins (thanks to mana flood).
Both sides board in Pollen Lullaby, and Kithkin also nabs Brigid.
Fast starts by both sides, but Kithkin is faster and once again Merfolk finds itself on 8, and with only a Mystic Gate for blue.
BTW: How does Sower of Temptation work if it’s Mirrorweave’d into something else?
Two Wilt-Leaf Lieges are played, although the second eats a Command.
Merfolk plays Pollen Lullaby and wins, although its Mirrorweave alpha-strike is met by … Pollen Lullaby, although Kithkin loses the clash. An attacking Brigid (previously flipped from Windbrisk Heights) makes a soldier token from Militia’s Pride, which makes it’s way past a blocking Reejerey for the win (via a Mirrorweave on Wilt-Leaf Liege).
Kithkin wins.