Beck is strong, but I feel like it's only strong in formats without Glimpse + Skullclamp. Those two cards are far better draw engines in the kind of decks you'd play Beck in in Vintage.
Glimpse is the better card; I meant the raw effect itself of Beck is stronger. I don't think combo is the home for it. If it has a use in Vintage, I'm thinking it could serve as a draw engine (as opposed to combo enabler) in some deck that could easily draw 2-4 cards from it on a consistent basis without contorting to use "bad" cards, either because it runs Forbidden Orchards plays Ninjutsu or some other natural means that have creatures frequently entering the battlefield. My gut instinct is it wouldn't be fantastic, but I'd be curious to see.