http://s36.photobucket.com/albums/e15/Fall3n_hero/?action=view¤t=socket.jpg&newest=1
any idea?

So you are looking for suggestions on what to put into the sockets, is that it?

Well, tomb reaver is mostly used by people doing mf runs. They put it on the act 2 merc and try to get the merc to deliver the last hit on bosses in order to boost mf chances.

So if that's what you intend to use it for, the ideal solution here is to put in 3xist into it if you can afford that.

Even without any socketing, this weapon is still a very good and powerful choice for your merc, especially against the undead.

Who's the weapon for? Yourself or to sell? And what character?

If your selling/trading it, keep the sockets open for sure.