This is our proprietary skill rating calculation. This has nothing to do with official game ranking or MMR.
The purpose is to show player skill levels relative to other players, not estimate MMR.
PASSIVE - On leveling up, heal 15% of your Maximum Health and Mana over 3s.
PASSIVE - You permanently gain +1 Health and +0.6 Magical Power per Stack, and receive 5 Stacks for a god kill and 1 Stack per minion kill. At 75 stacks this item Evolves, gaining 10% Magical Penetration and 25 Health.