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 - You gain additional Magical Power and Lifesteal scaled from missing Health. This caps at 70 power and 10% Lifesteal at 40% Health.
PASSIVE - You gain Magical Power equal to 7% of your Mana from items.
PASSIVE - Restore 1% of your Maximum Mana upon damaging an enemy god with an ability, once per god.