While this might be the best Malzahar skin out while also being nicely priced, I feel it lacks the awesomeness that the other two skins have. It seems like you had the solid idea of transforming his minion into a poro and changing his W to be a really cool blizzard, but besides that didn't know what to do with him.
His Q is just recolored with some frost particle at the end, his ult is recolored with some snow blobs around the enemy, and his E is probably the most disappointing part. What are those blue blobs supposed to be? I like the frost wind particle effect at the end, but the blue blobs are disappointing. They could have easily been tiny snow flakes that grow in size, just how the blobs change size. I know you probably left the blobs there to be similar to the base skin particle effect so everyone knows you are against a malzahar, but I think people know malzahar enough for you to have changed it up a bit (just like how you are changing dragonslayer braum because you think everyone knows his skills now).
Ultimately, like I said in the beginning, this is a good skin that is definitely worth the price, but I have a feeling that it could have been a better skin with a bit more love.