It means that you may have two commanders if one of them has choose a Background and the other is a Background card
Lifegain strategies are among some of the most popular ones in any format, and Commander is no exception
At the beginning of your upkeep, if your devotion to white and black is seven or greater, create a 4/3 white and black Vampire Demon creature token with flying
This is a Ravenous Rats for one foe and then a Megrim too
Each stun counter stops a creature from untapping for a turn, so if you put three stun counters on a card, it will remain tapped for three turns
it'll take a while, but despite having a great track record at otherwise adapting a lot of different fantasy creatures into playable cards, MTG had a very long and storied history with trying to adapt werewolves