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.
These build is for Assist a lot.
In Early game.
You start with Regrowth so you can take some risk early with your tantrum and bandage toss. If you didnt die till level 6 you have enough money to buy the boots and here is when FUN begins.
In Mid game:
Now you have 435 in Movement so you can asist your team and with teleport. Your ulti is your wepon for this. At level 9 you can buy your first Sunfire Cape and help any line with minions. Now your strategy is gank with bandage toss - ulti, or make bait for a massive attack with your ulti.
In Late game:
Now you have your Guardian Angel and you are unstoppable. at level 15 you have to have NashorÂ´s Tooth for cooldown now your ulti is faster and BAM. At level 18 your combo is:
Active Despair - Badage Toss - Ulti - Tantrum. No hero can resist these.
Personal, I always finish with 15 or more assist with these build.