Lasombra - Dark Steel

I would also play Arms of the Abyss over IG, you don't have any prevent so why take anything your opponent does to the face when you can just dodge it instead and hit him with additional. If your worried about s:ce can play couple thoughts betrayed for those. Shadow Steps are also not bad, stops random chump with sniper rifle ruining your day, especially taking in that you have no presses (apart from IG which doesn't help if the range is long on first round). And finally, with all that dom bleed, some shadow plays for surprise stealth wouldn't hurt either.

I would also play Arms of the Abyss over IG, you don't have any prevent so why take anything your opponent does to the face when you can just dodge it instead and hit him with additional.

Rush deck needs answer to s:ce and thoughts betrayed are to costly. It's no coincidence that IG is a staple tournament card and TB are not.
If you come across another hard hitting deck he is going to play IG so you won't play your arms of the abyss.

Shadow Steps are also not bad, stops random chump with sniper rifle ruining your day

it will be very good in such situation and quiete weak in others, I think Pentex does this job much better and is more versatile.

And finally, with all that dom bleed, some shadow plays for surprise stealth wouldn't hurt either.

That's true, I'm just thinking what should I remove. And that would probably be shroud of absence/ seductions instead of shadow play as they are free.

Because every hard hitting deck uses close range potence combat, huh? Also why you so afraid of blood costs? Thats what taste of vitae is for.

Because every hard hitting deck uses close range potence combat, huh?

I would say that almost every close range hard hitting deck is using potence

Also why you so afraid of blood costs? Thats what taste of vitae is for

Blood management is a key to succesfull combat deck. It's not always possible to taste back. Becouse of this as a general rule, when playing combat deck you should try to minimalize blood cost of your cards. If that doesn't convince you please refer to TWDA. There is less than 20 decks using TB (last one one year ago, majority older than 5 years ago) and usually in less than 5 copies and almost 200 decks using IG, usually around 10 copies.

The blood cost comment was more referring to you preferring shroud over shadow play. Yes I wouldn't play more than 4 or so thoughts betrayed, you don't really need to be able to prevent s:ce in nearly every combat, though I personally prefer more bleed focused combat decks with just some rushes to take out key minions/slow down predator. Also I wouldn't play Rumble in this deck, taking in only half of your crypt is sabbat.

The blood cost comment was more referring to you preferring shroud over shadow play. Yes I wouldn't play more than 4 or so thoughts betrayed, you don't really need to be able to prevent s:ce in nearly every combat, though I personally prefer more bleed focused combat decks with just some rushes to take out key minions/slow down predator. Also I wouldn't play Rumble in this deck, taking in only half of your crypt is sabbat.

It's matter of which way you prefer your deck to be focused. This one is for sure more combat oriented.
Rumble is there just to be able to enter second combat after monster untap and there are only two because of what you wrote (only half of the crypt is sabbat).