Anivia is a great early game killer. go with mejai and catalyst first. THEN sorcerers shoes, THEN rod of ages. why catalyst? because it makes anivia surprisingly durable in solo lanes. as for skills, you want one in the wall by lv 10 because around then you should start ganking, and we cant have you ganked while ur trying to gank now can we? that way, we can easily escape with wall-flash combo. if they chase, by then your buddies should be covering you. as for clarity... no. just no. any good anivia user knows how to work anivia. for 3v3 you go chalice. for 5v5 you want mana potion and blue buff. by late game when you dont have time for buffs, you shouldnt have much of a need for clarity because you are either close enough to just go back or you are far enough where recalling wont make much of a difference. chalice is also helpful, but we know thats not always possible. flash ignite is far more useful. lets you feed early game.