As noted earlier by Susan, some of the uncommons are the most challenging cards to obtain in high grade
Now if the UG lands player doesn't have a sufficient landfall threat on the board, he or she can still find value in returning their lands to hand, discarding them for value (maybe to Wild Mongrel, Noose Constrictor, etc., or Turntimber Sower, if not Trade Routes), and having options to re-play them for future landfall triggers or other shenanigans
So you can easily harvest 14 or 15 mana of cards from your 7 mana investment even in a deck not built around breaking it
In this article, well explore what the game is, how it performs, how it makes money, and why it has quickly become one of the most successful mobile launches of the past year
They wont completely dominate a decks strategy the way new commanders do, but they still have unique effects that are difficult to replicate even today