Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Start of with the tome and the rod for some extra dammage for picking off low healthed enemies at long range. The belt for a little more survivability, expecially with the lack of boots so far. About this time i get boots, so i can run like hell from any possible ganks. Tear of the goddess is always good for those times when the game is too fast paced to return without loosing a turret. The guardian angle is always nice for a surprise attack and health regen with passive. The soul stealer is a little iffy as to when you want to get it. Really, with my build, if i solo in mid, its a little difficult to kill anyone unless i have ultimate, so i save that for later so i can PWN. Finish off the zhonyas ring so you can tank for two seconds while doing a ton of dammage in the middle of enemy team's gank. finally the scepter for a little extra oomph of health and AP.
Now, as for actual gameplay, since the pool is lvld up so fast, obviously you kill minions furiously but loose mana fast. keep mana potions on hand at all time. also, when you are not mowing minions down, harrass the opposing player with snare. Keep doing this, and the player will fear you, not wanting to get close. Another thing, letting your mana get extremely low, and when you are attacked, use clarity for a surprise ownage. Allows for a very easy kill. A good tactic in midgame is save the majority of your skills for your teammates. for example, save snare for a time when an ally is at low health and is being chased, and use spell shield just in case. This helps in several ways, one, it stops free gold for opposing players, two, everyone is happy and the game is WAY more fun, and three, when you are in the midst of battle, saving your ally, use your ultimate when your ally is being chased, it slows the champ down, and they have no idea whats happening.
Morgana works great when you focus on taking out minions at first and teamplay midgame. It leaves for domination of enemies late game, racking up your KD ratio very nicely.
Thats it for now
GL and HF