Fiddle is a fairly easy champ to play. He is somewhat of a support, but can do a lot of damage and is good at initiating. I recomend he be played mid because he tends to be able to stall of a lot of champs because of his E. I find runes a matter of preference so they won't be gone over in this guide really, I just supplied my perferred runes. Farming is made easy with your E and ulti. Only use your ult if you really need to clean them up fast.

As with all mages, it helps to go completely down the AP line in Offense. If you need a little more staying power, then put some points in utillity to get spell vamp. Sorcery and Arcane knowledge are used so you can either keep you drain up continously or so you can spam your E. Both of these tend to annoy foes to no end.

Start with dorans ring. This gives you a nice health boost as well as AP and mana regen. Next you will want to rush Catalyst since you will be leveling alot in mid and it gives you more of a health and mana boost. Now you can choose between grabing boots of speed then Ages or vice versa. Next grab either sorcerer's boots, merc treads, and ninja tabi depending on the enemies you face. If there are a lot of tanks, grab sorcerers so ;you can rip through magic resist with drain. If you are in danger of being melted, then you should grab merc or ninja. Next build up to Rabadons to start ripping enemies to shreds with your abilities. Build Abysal to help you stay alive against other AP champs. Build WotA to add more spell vamp to you and your allies. Finally top it off with Zhonya's to help against AD champs.

Some other options to put in there could be things such as Void Staff, Unholy Grail, Rylai's, or morellos tome.