Depends. I've tried both versions. With the HG as well as the precog. Both have their pros and cons. The precogs can tell what is in your opponents hands as well as being cheaper, however, they take up more room. The hourglass on the other hand is reusable, but it can be stolen, destroyed, costs more, and you only have one. The hourglass tends to draw PC away from your wings though. When I was playing this deck, I found an improved blessing to be useful. It works to protect your weak growth creatures on the first turn as well as pulling many of your low health creatures into unboltable range. It also synergizes well with TU.