Lol. I haven't played war beast in forever. He's a good arach counter.
This is my Sand Wraith build:
I start out with iron sheild (duck bootsx2 + 250sheild) and a single minor totem (all I can afford left)
Once out in the lane (usually legion bot), I farm a 350trinket of resto. If the enemy's heavy magic, I go ahead and buy another one now to build into shaman's headdress.
Boots next. Steamboots is my preference. You go as fast as EMarchers all the time and you get a boost to your agi that you can put on str if need be. I usually keep on str until I start ganking.
Come lvl 6, if I had the lane free of harassment, I usually have my boots and a trink of resto or two. If it''s a bad farm, trink and maybe regular marchers. Here, my ults up and I'm ready to gank. I keep farming until I notice 2v1 in a lane or a fleeing low hp hero. When the time's good, ult, let the illusion get a couple hits in and then tp to it and melee a bit more. Usually they dont realize that you've tp'd, esp if they weren't attacking it. As soon as they start fleeing, cast your sand dart on them and just auto attack until hopefully dead. Lather, rinse repeat. Every the ult's up, a kill should be made. More if possible.
Usually finish my shaman's headdress next which grants a large amount of survivability. If the other team's heavy melee, I usually go vanguard instead. Did they add disassemble-able iron sheilds yet? If so, cool, if not, oh well, it's only 250.
Next is rift shards. They're cheap and easy. Whenever I have an extra 1k lying around I just upgrade it. 3 upgrades (or was it 4?) and you've got a top tier item on the scale of wingbow. Not much else is needed unless you're really raking in the cash, in which I suggest getting assasin's shroud. Damage and survivability.
I've been messing with 250shield and 350trinket as a start and it's alright, but you lose 6 agi (last hitting power and aspd) for regen right away. I usually just get it once I'm in lane since I can't get a courier to start with. I usually do later though 'cause neki shares his robs with me
Edit: essentially, I just build him like I would NH since their roles are the same: ganker. Sure, SW carries nicely but that's not where he shines. His slow is one of the best in game and even lets you track invisible units. I got a kill in invis puppet master once 'cause I sand darted him before he went invisible, so the sand just followed him around.
None.