I've got a count of 51 cards. The year with the most was 2011, with 12 different Cubs relics. Coming in a close second with ten was 2012. Imagine, 22 relics from just two year.
The fewest is a three-way tie between 2006, 2014, and 2015, when just one Cub was in the set. The Cubs finished in last place all of those years.
The most popular Cub is Starlin Castro, with five cards. Four Cubs have four cards, Aramis Ramirez, Carlos Marmol, Koskue Fukudome, and Anthony Rizzo.
Enjoy a peek at all 51!