Bronze mid-lane

Hi people,

I'm currently bronze 1 and I'm struggling to climb now. Bronze 1 is what I ended on last season and have climbed back from bronze 4 at the start of season 5. However It's been playing a huge group of champions, none of which I've felt 100% comfortable on. I'm looking for a group of three (four?) champions to play mid lane to carry me out of bronze and hopefully silver by the time the season ends. I'm having decent success on Vladimir mid recently, so I guess I'm kinda looking for an assassin and a long-range poke mid. Suggestions would be greatly appreciated :)