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That depends entirely on what color(s) you're running and what the basis of the deck is. Unfortunately, blue doesn't have much going for it.

Thirst for Knowledge and Jace Beleren are probably my two favored default choices for blue. Compulsive Research can work so long as you don't mind it being a sorcery. Perilous Research can be an absolutely wonderful piece of draw in the right setting. If you do go the Perilous Research route, it might be a nice idea (if you feel) to throw in 1-2 copies of Hatching Plans (too many and you'll get watered down with them). Ninja of the Deep Hours is very conditional and long forgotten, but it can still work in a limited fashion. Probably its largest use isn't the draw feature (which typically ends up being a cantrip), but that it bounces. All in all, your best bet for "draw" in blue isn't so much draw itself, but playing like a boss and taking advantage of things like Snapcaster Mage or Spellstutter Sprite . Card advantage is card advantage whether it's drawing you cards or not.

If you want ideas for other colors, you have to say so.