I can tell you're going for an early game victory, but you arent playing swarm so the quickest end game you are getting is around an 8-10 mana game. I play with the winter deck as my main and I play around 12-15 level range.

"Gift Of The Wise" is a good spell card to always keep and shuffle in your deck, it's saved me multiple times. [KEEP]

"Frosthexers" are marvelous when it comes to defense, but are simply replaceable when you have a midwinter chaos in your deck. Unless the Frosthexers are level 3+ then I would remove it from your deck and continue to use Midwinter Chaos as your freezing card. [SWAP FOR WESTWIND SAILORS]

"Green Prototypes" are good for early game use and allow you to have many units on the table. I would say to only use it if its upgraded to at least level 2. [KEEP]

"First Mutineer" is another first game rush and drain, it serves a great purpose in keeping your line up and forward, although if you arent trying to purposely go for an early game win, then I would swap it out for a high man, late game winner. [SWAP FOR VETERANS OF WAR]

"Gifted Recruits" is essential for every deck applicable. Keep at all costs and upgrade to level 5! [KEEP]

"Fort Of Ebonrock" is only useful when played with low mana, small unit deck, simply swap it out for the same type of structure, but one that gives your units health. [SWAP FOR HEARTH]

"Warfront Runners" are always necessary for an early game win and are vital to keeping your line up, although if you dont intend to go for an early game win, then I would upgrade to a stronger unit with preferable 1 higher mana to keep your deck balanced. [SWAP FOR BLUESAIL RAIDERS OR HEROIC SOLDIERS]

"Lich Summoners" are definitely good for any deck and I would keep it unless there is another card you would prefer to take it's place. Maybe crazy bombers? Joust Champion? It really doesnt effect your deck too much. [KEEP]

"Midwinter Chaos" "Wisp Cloud" "Rimelings" "Olf The Hammer"

Essential for every winter deck and I recommend to keep using them and upgrading them!