You can still get 8% spell vamp from runes and masteries

I don't know I don't own him.

Not worth.

Movement quints are better for offensive build. SV quints for tanking.

</New Vlad is bad>

is it good ( worth ) on swain because of his ult plz answer

They might be slightly better than 15 ap later game but they are a lot worse earlier. It is also very questionable because 15% scaling cdr and movement speed are probably much better runes for late game.

It's better for people who don't have sustain but could benefit from it, like Rumble.