If another team comes with us, then whatever team that is will have a rivalry with us, as we'd both be newcomers, and its already likely a team we have history with. (Boise, SDSU)

If no other teams are added, then probably whichever team we have the most history with. Houston comes to mind (namesake rivals). I could see Memphis games getting snippy. Giving current coaching staffs and our history playing Air Force, I could see Navy as well. Cinci would be up there too just as we're typically grouped in with them when B12 expansion smoke comes.