sorry about the double post, the mobile version of the site doesn't allow edits. The reason is that i just realized the cantip effect you added seems just right and would make me pick it over R&D, in fact I wonder if it should cost 1{u/w} as a cantrip?
Cards that cost 2 and cantrip usually Do Something, some examples being Abeyance, Remand, Elvish Visionary, Interdict, Bind, Guided Strike, Carom, Aggressive Urge, and Clear. Adding a card into your library seems pretty marginal by comparison.
I like having the card shuffled in as opposed to placed 3 cards down (or wherever), since it adds a bit of excitement to the draw. One thing that can make a card exciting is if it gives the opportunity for great stories, eg. "I was dead on the board and had no outs in my deck, but I cast Wish and a Prayer for my sideboard Banefire, drew it, and won!" These kinds of stories will be rare, but they'll be out there, and I think that equates to Fun.