I've been really enjoying this set, it seems a bit slower and more complex to me than the last couple. All the colors except green seem decent and even the aggro decks need a lot of synergy to function well.
I went 7-1 with this Dimir Descend deck on the back of [[Aclazotz]] and two Uchies. The playset of [[Echo of Dusk]] was really good - turns out a 2 mana 3/3 lifelink is pretty dece.
The Dino deck is real and green can be good but I think in a vacuum it's got the least efficient cards.
I think Inverted Iceberg is better than average for the first two copies in slower U/W/B decks. But I would avoid playing it in the faster U decks, like UW fliers or UR artifacts