Shadow Fiend is a great hero to improve mechanically in Dota 2. This hero requires precision, farm efficiency, positioning and skill. It's also the perfect hero to improve your mechanics over the mid-lane. That includes lasthitting, harassing enemy, clearing waves, rune controle, stacking jungle, mana management and item knowledge. This is my way of playing the hero and I tend to skip eul's scepter and mekansm and go for a carry-build instead.