Shadow Fiend getting Ethereal Blade

A Dota Forum suggested with a unique SF build. Shadow Fiend with Ethereal Blade. Is this viable?

I understand that many people have tried this build and worked for them. Ethereal Blade deals damage equal to x2 of your Agility and causes the Unit to take extra Damage from Spells. Shadow Field with plenty of nuking power from his Razes should be able to take down most Heroes.

Combo :

Ethereal Blade -> Walk towards him -> Raze x3

This should net you a kill easily.

However is it really that good compared to the usual Shadow Blade into BKB and into Damage items ?

Looking at the pros and cons :

Pros:

1) Ethereal Blade causes him to easily aim his Razes since the Debuff has a slow components.

2) SF has a decent Agility gain allowing him to do decent damage with EB's active.

3) increases SF agility by 40 which helps to increase his attacking capabilities

4) Allows SF to be immune to Physical Attack allowing him to cast his Ultimate without being attacked (spells still can hit him)

Cons

1) Does not address SF's biggest weakness regarding his HP and lack of escape mechanism

2) Ethereal Form for SF can be burst down even faster than normal .

3) SF requires time to cast his razes thus within the intervals he can be burst down.

4) DIFFICULT BUILD UP. I believe this is the reason why EB should never be core on SF 5k gold is a lot of money and unless you are snowballing very hard it difficult to farm up this item when you have no escape mechanism and one of the easiest Heroes to gank.

I still feel the usual builds are better. Looking at the cons it clearly shows how unreliable EB is and how opponents can counter it (Pipe) . Its more of a fun a cheeky build compared to the usual.