This build give a very nice early, don't worry about the mana, you can clear the jungle camps with no more of 4 basics.
The fun begins in the mid game when you'got the Serrated Edge, in the late game no one can fight you 1vs1.
The Heartseeker is circunstancial, you can buy Bloodforge for a tryhard a little.
Protector of the Jungle
PASSIVE - While in the jungle you gain 15% Power and 7% Protections.
Hydra's Lament
PASSIVE - For 8s after using an ability, your next Basic Attack will deal an additional 25% damage. Abilities that function like basic attacks do not benefit from this. PASSIVE - This item grants 2.5 MP5 per 10% of your missing Mana.
Y10 Serrated Edge
PASSIVE - For every non-ultimate ability on cooldown you gain a stack of Cruelty. Each stack provides 7 Physical Power and 2% Physical Lifesteal.
Heartseeker
PASSIVE - Your abilities deal an additional 2% of the targets maximum Health as Physical Damage. If you have over 150 Physical Power, your ability bonus damage scales up. This effect reaches a maximum of 6% Maximum Health damage at 250 Physical Power. Subsequent hits on the same target do 75% of the bonus damage for the next 3s.