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.
Max out Reckoning first as it is most effective and only use ignite when they other player is running away and he is on quite low health.
Clarity is used because u will use up your mana quickly so u may want to buy a mana potion if you want.
This may not get u many kills but will definitely support your team in killing the other team in big group battles.