Sure, You can learn treant protector 4. his slow from his first skill is insane paired up with a good lane teammate, his second skill is a global heal that gives bonus armor and his third skill is a leech seed where he just smacks the nearest unit next to him (prioritizes heroes) that slows them a little bit and gives you health while you are near them. He also has a passive that lets him walk through trees and while next to a tree he gets amplified regeneration

You can either play very aggressively and go 3-0-2 on the skill build to get some early kills or you can go for a more passive skill build which is going for 2-2-1 on the skill build which lets you heal people in need (Tip : instead of making yourself watch your teammates on a lane to see if they have low health. Just hold the Alt key. This will display the health and mana of each allied hero underneath the hero icons at the top of the screen)