Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
wards are important. farming might be hard, reason for philosophers stone. in team fights, use your e against the other team, do not use it to give mana to allies (unless they extremely need mana). Make sure your e skill (infuse) silences a high priority target; i.e. a mage like annie or someone who has a strong skill like amumu. STAY BACK. Your cooldowns will be high early game, this build is good for burst fighting, team runs in gets a kill then runs out you re heal etc. farming is not important as a support philosophers stones will handle that.