Rats. Some people keep them as pets. But as an adventurer, you know that you're probably going to have to go deal with some oversized rats at some point. Though much of the time the rats aren't armed and armored. The Ratlings in Massive Darkness are armed and armored and are a new add-on for the campaign.
Rats are also rather social and thus, tend to hang out in large groups. You certainly get a large group of rats in the Ratling pack. How many? Well, with the crossbowmen, warriors, agents, bosses, and the humongous Bully, you get 22 rats of various types. You also get all the requisite cards with which you can play said rats.
10 days left to get in on the action.