Blitzcrank The Great Steam Golem's Abilities

Mana Barrier: (Innate): When Blitzcrank's life is brought below 20% health, he activates a Mana Barrier, creating a shield with 50% of his mana, which lasts 10 seconds. This doesn't use any mana. This effect has a one minute cooldown.

Rocket Grab: (Active): Blitzcrank fires his right hand at a straight line to the target area. If his hand encounters an enemy unit, it will stun them, deal magic damage and pull them to him.

* Cost: 140 Mana
* Range: 1,000

Cooldown: 20 / 19 / 18 / 17 / 16 seconds

Magic Damage: 60 / 120 / 180 / 240 / 300 (+0.8 per Ability Power)

Overdrive: (Active): Blitzcrank super charges himself to gain dramatically increased movement and attack speed for 8 seconds.

* Cooldown: 15 seconds
* Cost: 75 Mana

Movement Speed: 16 / 20 / 24 / 28 / 32 %

Attack Speed: 30 / 38 / 46 / 54 / 62 %

Power Fist: (Active): Blitzcrank charges up his fist to make his next attack deal double damage and pop his target up in the air.

* Cost: 25 Mana

Cooldown: 9 / 8 / 7 / 6 / 5 seconds

Static Field: (Passive): Blitzcrank causes lightning bolts to deal a small amount of magic damage to nearby enemies every 2.5 seconds.

(Active): Blitzcrank can activate this ability to deal a huge amount of magic damage to nearby enemies and silence them for 0.5 seconds. This cannot target stealthed enemies. This removes the passive lightning bolts until Static Field becomes available again.

* Cooldown: 30 seconds
* Cost: 150 Mana
* Area of Effect: 600

Passive Magic Damage: 100 / 200 / 300 (+0.25 per Ability Power)

Active Magic Damage: 250 / 375 / 500 (+1 per Ability Power)

Mastery:

Offense: Archaic knowledge and Sorcery is a must!

Defense: Do whatever you like! I personally like 21 points in defense.

Spells:

I personally use Ignite and Flash. Ignite is very useful in early game when you grab them to your turret and ignite your prey. It is almost always a definite kill unless you have a noob teammate or he flashes away. Flash is very useful when running away from ganks or a counter when the opponent chases you to the turret.
Ghost is also a good option, Ghost + overdrive is just like an ferrari.
Exhaust is also another good spell slows them and then gang rape.

I buy Sapphire crystal + 2 health potions in my early game. Since rocket grab requires a lot of mana in early game and the Sapphire will definitely help. Next grab a pair of converse, Ionian Boots of Lucidity and if you can, get frozen heart, its CD reduction is also crucial for Blitz's game. Rocket grab requires a fairly amount of cool down along with static field, it will have a great impact in late games! The next few items are self-explanatory.