this is my first build on mobifire and thought i might share a build i used agianst a dps team and scored a quadra kill i hope you like:)

for my runes i like to go complete AD because it gives me a edge in early game and makes it possible to feed myself to finish my build faster. Feel free to add armor pen runes or heath runes because they also seem to help in the early game.

masteries are simply AP, magic pen, and full defense tree.

for my items the mana crystal helps alot considering early game blitz is very mana hungry with his rocket grab ao make sure to only use it when you have a garunteed hit! next boots help track down those early game kills everybody wants and serve as an escape item as well, any boots of your choice but boots of swiftness is your best bet. turn your crystal into manamue which will solve your mana hungry problem later in the game along with a nice boost to your AD. for a nice heath boost pick up Frozen Mallet, it allows blitz to take more damage and slow those kills that are always trying to run away. once frozen mallet is done grab thornmail for those pesky squishy DPS which will think twice before they attack you agian, next frozen heart with be a great benefit to your AD because of manamue and 99 armor makeing you more tanky and harder to kill, finnaly finish it up with a nice sunfire cape giving you both more heath and armor making you literally a walking tank(or rolling depends on wich skin;) )

for summoner spells you can never go wrong with good ole ghost and exhaust but clarity can also be a great a choice if you fear your mana will dissapear because of all the missed rocket grabs

PROS:
great team fighter can take lots of damage and has great damage output.

rocket grab allows to snatch one of the opposing team for an easy kill in team fights.

can save squishy teammates with both rocket grab and power fist.

CONS:
very mana hungry early game

slow early game and can be easily chased down

this build can only defend agianst AD champs not AP