If you have in your hero pool Ursa Warrior (yes I know that op combo), Windwalk/Blink characters and morphling, u've got yourself an awesome combination. Pick Ursa Warriors overpower, Morphlings morph, ANY windwalk or blink and Ursa Warriors Enrage as an ultimate. The Overpower skill will give you high ammounts of speed no matter that its attack limit is 6 at max, The windwalk or blink will allow you to bring you closer to opponents in a short period of time, or it can be used as an escape skill. Morph skill is both early and late game skill for this combination. In early game you should level it ONCE and at lvl1 and morph all your agility to strength, cause you got attack speed from overpower and from morph u will get damage and life. In late game this ability combines quite nicely with his ultimate skill. Enrage will give you 5/6/7% damage of your max HP giving you amazing ammounts of damage due to morph. The ganking/initiating of this hero should be like this = You use overpower, enrage near your opponent (still in his fog area) then you use windwalk or blink and just autoattack him. He will be dead in 1-2seconds depends on his survival abilities. The Overpower has short cooldown but for a strength chatacter this hero needs some mana. Bloodstone is not a bad idea for a second item after boots (Phase Boots/Power Threads (strength)) to raise your hp and you don't have to worry about your mana anymore. For second item Cranium Basher would not be a bad idea. But getting items shouldn't be hard because its a strong build.
NOTE: THIS BUILD ONLY WORKS ON STRENGHT HEROS!