A land that becomes a spell later is really, really useful. Even if it is a bad spell, it is basically an additional spell drawn for free. And sacrificing a land is a negligible cost later in the game, unless your deck has a really high curve.
A spell land for a higher cost is okay.
Sacrificing a land for a good effect is okay.
Putting together a high cost and sacrificing a land is where the problem lies here.
Very solid uncommon. It also reminds me of Pelakka Wurm, another very solid uncommon, back when I was drafting Rise of the Eldrazi when it first came out.
We drafted Pelakka Wurms so much that it earned a permanent retirement home slot in our cube..love that card.
This card is slightly weaker in that it probably will never gain as much life as the wurm, and doesn't give you a card back when it dies, but Scrying is always nice and it's easier to cast, so there's that.