In standard, this is okay, as there are relatively few cards for 
right now that enable the caster to directly search their library for a creature. Searching the library is a big difference from drawing a card, something that seems to be easy to forget. In creature-heavy decks this can be a great utility card, especially with Blood-Rush creatures replacing instants or sorceries, enabling more targets for a search.
Personally though, I would actually prefer to play something like Wild Guess over this, simply put because I feel the fact that the creatures must be revealed ruins most of the strategic value this card can offer. Not only does this force you to pick creatures with different names to have any effect, but the two creatures that are shuffled back into your library will only alert the opponent to what you are running.
Posted By:
MechaKraken
(4/5/2014 12:26:56 AM)
I've used this in my Prossh, Skyraider of Kher (Goose) EDH since I made it. It's helped endless times. I usually search for Rune-Scarred Demon, Fleshwrither, or Purphoros, God of the Forge. In the end, I'll get Purphoros, God of the Forge. This card is like a 2nd copy of Demonic Tutor for EDH.
Posted By:
Ansem717
(5/28/2014 2:48:11 AM)