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.
This build is a bit riskier, as it requires you to NOT DIE. You pickup taunt first for a first blood for your team, if not yourself. Either way, it's demoralizing for the other team. If you think that there's a good chance that you will die a lot/much, swap Leviathan and Sunfire in the item order and that should solve your early game issues. I try to get Levi early to have the opportunity to get to 20 stacks, but it doesn't always work out that well. On occasion, you just need the early aura to boost your cash flow. The only real problem that this build tends to have is running out of mana constantly. Thus Teleport to pill back and port into the fray.