I think too many people underestimate this card. At the very least, it's an Unsummon with Scry 1. At most, it's a Repel for two less. Either way, it sets your opponent back a turn in regards to what they have on the field. However, I think the clash is also a very important part of this card. Knowing what your opponent is about to draw (or isn't, depending on what they choose) is important. Not great outside Limited though, there are much better options, so I'm not sure you'll see this outside of drafts and Sealed.
Pros: Potentially cheaper Repel
Cons: Only hits creatures, may only be Unsummon