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.
Stay at the back minions so your opponents cant get xp easily, harrase them with your ice blast and when you loose hp consume a minion.... Save your flash for when u get an enemy low hit them with an ice ball and quickly flash on top of them and pop your ult.... If you timed it right they should have 50% less movement speed + your ult reduces movement speed by around 30ish % which is -80% movement speed and its gg they wont be able to get out of it without flash/cleanse/ or an ulty