I made a lot of changes to the deck.

The deck ramps much better now and is much more consistent. Oracle of Mul Daya, Zendikar Resurgent, and Tempt with Discovery (for now) have really made this deck explode.

Sorry for the late reply...

@ThePlaytester In my playgroup, Unblockable has been very helpful since they usually play many flyers in their deck. Whispersilk Cloak is mainly for my commander to pull off his effect more easily. I tend not to attack much with this deck and deal damage mostly through Dragon Tempest and Scourge of Valkas (though this nerfs the deck a lot probably; I'm very casual with my EDH deck xD).

The problem I've been having with removal is I'm not sure what to take out for the cards. Also, from what I've discovered, U/R/G doesn't seem to have much removal in it that's not countering, burn, or fighting. Should I make room for Ryusei, the Falling Star, Earthquake/Firespout, or Chaos Warp? How should I do so.