This is my first post here so sorry for my bad english!
I'm trying to make a semi-competive U/B Delver control list. This is what I currently have
http://deckbox.org/sets/623989 I think it needs a better finisher than just Delver, what would you suggest? I may occasionally play this in FNM, but mostly just with friends. What changes would be good for this deck?

Devour Flesh is 100% better than tribute. So I would look to replace those.

A couple more of Snapcasters wouldnt hurt.

I would look at dropping Forbidden Alchemy for another piece of removal or two. Maybe Tragic Slip?

Finally this may be wierd but Lilly doesnt much help the deck really. You want cards in hand to be able to keep throwing down answers and otherwise shes just an expensive verdict.

I would say you also have a few too many lands. Delver is great but tends to work better as a tempo deck than a full on control. Think about dropping in another light beater like Invisible Stalker or NivMagus Elemental

It looks good to me over all.

Othercards to consider

Serum Visions
Sleight of Hand
Echoing Truth
Remand
Spell Pierce