Not into it. I've only played with Library in the mtgo cube (the mube? mobe?) and the main reason its so unbelievably insane is it's a land: it works on turn one, you can almost never remove it, it costs zero, and it taps for mana. Magus doesn't do any of that.... so it's actually kind of a totally different card, and somebody should try it and see.
Edit: or redesign it to be riptide level?
I think its best chance is as a one-drop in a bounceland format so you still have seven cards in hand the first turn you can activate it. Even then it's pretty weak compared to the land. I've power cubed with Library and it's not really a great card to draw late-game, you absolutely want it in your first opening hand. It just has a lot more upside than the other colorless spell lands (1: draw a card, go figure). Magus i've only seen in EDH / casual Tiny Leaders but I've never been super impressed.
e: that said i've been trying to hit 1-2-4 on my ramp curves so who knows, if my players are cool i'll test it