The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
IMO, I would splash shadow. Add the 5/2 slime with unblockable (it is really a mini-bomb), the 1/3 that gives 5Str Lifesteal and the two one shadow influence revenge spells. Drop the 1/3 Decay flyer, one of the 7 drop gators, the 8 drop Wurm and one Beseech the Throne. I think that your power cost is too high (20% of your deck is 5 or higher) but I could be wrong.
So I tried Feln, and went 2-6, and then just said I'll wait for next month. I actually don't know why this deck did so bad (I'm a diamond player for Exped and Throne), so I'd love to hear your thoughts about the curve/power base, too many spells, whatever.
1 Blood Beetle (Set1 #260)
2 Beseech the Throne (Set9 #212)
1 Executioner (Set9 #151)
1 Frostbite Elemental (Set9 #118)
1 Lurking Brute (Set9 #152)
1 Sky Serpent (Set9 #121)
1 Spiritweaver (Set9 #153)
1 Extract (Set2 #155)
1 Grisly Contest (Set9 #159)
1 Midnight Hunt (Set9 #161)
1 Natural Order (Set9 #127)
1 Sorrow's Shroud (Set2 #151)
1 Vorpal Cutter (Set9 #165)
1 Water Conjuring (Set8 #98)
1 Brood of Eremot (Set8 #102)
1 Brutal Frostlord (Set8 #103)
1 Soul Collector (Set1 #291)
1 Stealth Strike (Set9 #135)
1 Tasbu, the Tempter (Set9 #167)
2 False Demise (Set9 #173)
1 Murky Tentaclesis (Set9 #174)
3 Spellbound Ursine (Set9 #138)
1 Vengeful Flight (Set9 #139)
1 Spore-Spitter (Set8 #145)
6 Primal Sigil (Set1 #187)
2 Primal Symbol (Set9 #109)
9 Shadow Sigil (Set1 #249)
1 Feln Vow (Set9 #208)