If your Commander has Choose a Background, you may choose any one Background card that will essentially function as a second Commander, adding its color identity to your deck, and following the rules of Commander tax and going back to the command zone when it would move from the battlefield to anywhere else
This isn't a first for a Secret Lair or anything, but I asked Heggen if that sort of thing is something they actively think about when choosing the cards for each new drop and while he didn't address the prices of cards specifically, he did say picking the right ones is more of an art than a science
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Giant, scaly, lizard types
1 Nightpack Ambusher An Angry, Furry Plan-In-A-Can Nightpack Ambusher was printed at a time when flash-themed decks were popular in Standard