My usual build is Null Talisman, Arcane Boots, Force Staff, Aether Lens, Octarine Core late game.
I usually level up Stroke of Death first then Ink Blot depending on who I'm leaning with. Revenant I typically level up late game.
For the ability tree I usually try to get as much cast range as possible...
Any tips? Grim is definitely not my favorite hero and I'm looking forward to finally winning a game.