Help with Budget Game Winners

Good evening ladies and gentlefolk, 

We've been building a F2P control mage deck to try and battle our way to legend, but one consistent issue we're having is including actual game winners. We can control the board quite well, but we sometimes struggle to take advantage of the board state (unless we hit powerful cards off Messenger Raven). We recently cut Linecracker because it just didn't cut the mustard and replaced it with Power of Creation which has done good work to date, but we feel there's something missing. 

Your challenge, should you choose to accept it, is to propose a consistent game-changer that fulfils the following criteria:

1. Compliments our current deck and playstyle.

2. Is a rare or common (epics will be considered, but they're much harder to build on a budget).

3. Has cool art.

Budget Control Mage Decklist

Number 3 is optional, but preferable. Here's the deck in action.

What is your deck list? I am not seeing it in your post.

Sorry, the image didn't link properly, I've edited the post so there's a link to it now. Thanks for the warning!

I put it here so it was easier for people to view because viewing it as an image sucks.

Yep that's much better! Thank you.