Hello.
So first off, you need to fix your mana base. You need to produce more blue mana and less red mana, according to your pie charts.
Now, a card I suggest is
Searing Blood. It can help out early in the game in destroying weak creatures, and will
deal damage to your opponent.
Also, I don't see much of a purpose for
Dig Through Time. While drawling cards are good and you won't send any away, I don't think it really fits in your deck. That is, of course, just my opinion.
Overall, I think it is a good, solid deck.