I hate to see you die over and over again in a multiplayer game and be the first down. I honestly do. I want to see you improve. And part of that is just going to be hammering efficiency and card selection into you over and over. The biggest thing is you can't handle any big threats swinging at you. Anything over a 1/1 or a 2/2 is going to murderlize you and you only have one bounce to deal with it and one big creature. Counter spells are good for stuff flung right at you, but creatures are cast passively, then attack you. You really need some big ass threat dealing cards with either some bounce or powerful damage so you can deal with bigger threats. I get that you keep things low so you can use Izzet Guildmage, considering you can cast for overload and then double it.

I'm just worried there's no real UMPH to the deck. Nothing to drop to actually deal with big threats or finish someone off. 

Invoke the Firemind is a good multiplayer long game card

throw electrolyze in there

I'm iffy on izzet guildmage. Tablet of guilds, out of here. Way of the thief, meh, it's an okay card, but it doesn't actually hold weight in your deck because it just doesn't do anything specific. Drop unstable footing and put in Skullcrack. It does the same thing for cheaper.

Hit Monkey. Listen. This is awful. But it's okay. I'm going to help you. I'll even trade you some dual lands. Drop Jace's Erasure, Levitation, rewind, bellows lizard. That'll get you closer to 60 which is how many land you have for.