One reason I didn't buy MA Heritage was that there were way too many sketches of Martian heads, so I am definitely liking all of the previews so far, I see lots of great bugs and soldiers and flying saucers, etc.
I also think the 4 card puzzles are a great addition, there are going to be some lucky collectors out there! Alvin, can you give us some idea of how hard it will be to pull a puzzle hot pack? I know a lot of the sketches haven't been sent in yet, so you don't have a hard count of them. But is the goal to have them be something like 1 in 10 cases?