I like Beseech the Queen. At it's worst, it's a one-shot Planar Portal at half the price, and if you needed Planar Portal for more than one shot then you needed a better deck. At its best it's a cheaper Diabolic Tutor with a minor variable restriction attached.
Knollspine Invocation is a bit like Mosswort Troll; it's a draft bomb that may struggle to break constructed. That said, it has a slightly better chance of breaking constructed. I don't really expect to see it, but the potential's there if other cards allow it.