I think Tamiyo, the Moon Sage would fit great in this deck too. Another issue is that you don't have any draw cards in this deck.

For me

-1 Gideon Jura -2 Dungeon Geists -1 Gideon's Avenger -1 Niblis of the Urn

+1 Tamiyo, the Moon Sage +2 Index +2 Ponder

This should improve your draw a bit :)

-2 Sunblast Angel +2 Frost Titan

-2 Index +2 Ponder

-1 Gideon's Avenger +1 Blue Sun's Zenith

Thanks for the help mate. I dont really think i need card:Blue Sun's Zenith because you need three blue, but im definitely getting some Frost Titan s

I think that until the third - quarter turn you're literally at the mercy of the enemy. try to "fill in" that phase of the game.

I would switch out some islands with Skyline Cascade . Authority of the Consuls would be killer in your deck and Seal Away and Nahiri, Storm of Stone might be okay. Bond of Discipline is also cool.