These sorts of cards are easy to miss, because it seems like you already understand what the card does, but the nature of multiplayer Magic naturally lends these cards a lot of complexity
Esper colors tend to be noticed for their control elements, but if you pair this commander with cheap and aggressive creatures like Esper Sentinel or Tenacious Underdog and back them up with signature removal spells from black and countermagic cards from blue, you get one of the most threatening decks in the format
Keening Stone: milling outlet that can be used against an opponent or for you to place needed cards in your own graveyard
But unlike Liege, not even Lily or Path can reliably hit this card
Summon: Fenrir might only be temporary, but you can get your free land and then trade off this saga creature for value, effectively giving you an easy two-for-one
By the time the redemption program ended, WotC was knee deep into launching The Dark set, and it is possible that the product kept around for redemption was stored away in some warehouse and lost over time, akin to how the U.S