Magic the Gathering Deck Help

Hello. I was just wondering if there was any experienced MTG players that could give me some help in structuring my deck. I play a Tricolor Blue/Black/Red deck that consists of many flying creatures, direct damage spells, a lot of artifacts/equipment and also contains 2 Planes walkers. Lilliana of the Dark Realms and Sarkhan the Mad. My deck is decent right now, but is there any cards that would fit a Blue/Black/Red deck well that you know of? I am also in the processes of obtaining Nicol Bolas,Planeswalker and Tezzert the Seeker and Tezzert, Agent of Bolas.
Any help would be appreciated! =)

I'd utilise blue's ability to cancel out spells. So Counterspell is a real nice 2 mana card for that. You probably want murder if you don't already have it and time warp seeing as black and red creatures can tend to be expensive so you can get extra time to farm mana. Then for red stick to agro instants and sorceries to make sure you're the only one with creatures. This is how I've seen that deck played well. Good luck! 

I'd love to help you out, but as I play mostly mono-color I can't offer to many specifics.(especially since I tend to play white)