This is a very exciting card. I think its best application is in 100 card decks where cards like Comet Storm and Fireball suddenly become insane. Aurelia's Fury becomes more playable, etc. I like a lot of what people are discussing with respect to this card. Strength of the Tajuru is a card that people have discussed quite a bit with respect to this card, lending it playability in a lot of potential decks.
Its slated inclusion in a preconstructed deck limits its upside and I don't think 60 card formats are excited about this guy, but he has so much potential strength that his modest presale price, though likely high, could be somewhat reasonable. I think this is very, very cool, but I'm not preordering. I am sure if you think about it for at least a minute you can come up with a cool interaction with this guy and anything that gets people brewing is good for a set even if it might not be super relevant financially. I like this card a ton and I am targeting foils if they start out reasonable.