2.0 w/l ratio using this build since the original dota, try it out once or twice before you give it a rating, not recommended for new players
Good team support - A support, someone with deso, aoe Damager, and a tank (ofc anyone with disable/cc helps)
Counters- Slows (np has low ms, boots of travel and sange n yasha can counter slows)
permastuns
heroes - razor, sb, void, drow, sniper, pudge and heroes with similar abilities

This build counters - Tanky melee heroes, squishy ranged carries

IMPORTANT::: Throughout the game make sure u carry tp scrolls (this may sound redundant but it helps gank, escape, and return to lane and jump lanes in between tps for extra exp and gold) also, As regards to my changes through now 200+ games i have decided, do not attempt to continuously gank and "help team" untill you have completed up to skadi in the fallowing unless it is a garentee kill and escape:

Early to mid game - first get gloves of haste after starting items, go straight for mealstrom, then either boots of speed or power treads (depends how good you are at keeping away from enemies) then shadow blade, zip everywhere around the map and farm farm farm, complete boots then go immediatly for skadi you are now ready to take on basically anyone, this should be around 20-25 mins in most my games unless its ♥♥♥♥♥♥.

Mid to late game - here the game is situational you may need anything from the fallowing:
Assualt curaiss, black king bar, monkey king bar, silver edge, heaven's halberd, scepter of vyse

If none of the situations are required then finish off with the fallowing in order:
Crit, finish off mealstrom, boots of travel(again, may sound redundant but double tp helps) heart, consume moon shard