I believe there's a pretty obvious one in Quebec City vs Nevada Battleborn. Both teams came into the league at the same time and if that's not a general story for a rivelary I don't know what is. Though I would say, bias and all, that Quebec has come out as the leader of that rivalry. But that's not the prompt.

Another rivalry that I think people might overlook with the Blue Birds is the Falcons. We've faced them in two (I believe I could be wrong and am not fact checking) cup finals. Last season being the most recent where we dominated them cause we're amazing. If you didn't know that Owls eat falcons well now you do. Again if I am remembering correctly both of my cup wins have come against the Falcons. Here's hoping for a third with Netman. Sorry Falcons but we love to face you in the finals.