Are these Topps cards you need to complete sets? 

No, I should be more clear. These are the final Topps base set cards of some great players. I still need some of them, check out trade matching if you want to make a trade.

Now which year was biggest in terms of last cards? 2010 seems pretty big with Griffey, Smoltz, Sheffield, and Johnson

2008 is a pretty solid year for final cards - Pedro, Glavine, Clemens, Schilling, Kent, Lofton, and Piazza.