I blame Dan. I mean the story/setting/ishness of the cards.

Kamigawa brought back memories of the old L5R days when it was about armies of warriors, magicians, spirits.

Ravnica is just neat in the fact it kinda makes people think outside the box instead of focusing on one color, they make you focus on two. And not just the staple pairings that always seem to go together, but even the odd pairings... such as Blue/Green (which will happen next set).