A deck that focuses on controlling the board by removing key threats would benefit from Final Reward, as it provides a cost-effective way to exile a creature, preventing it from being returned to the battlefield
And, a fun interaction, if you do clone a land or some other mana-maker, the Moritte version makes snow mana
Perfect Commander Pairings Combo potential aside, Attunement is just a really solid addition to a number of MTG Commander decks
Second it can get any land, not just basic, so it's mana positive, get that Gaea's Cradle, Tolarian Academy, Cabal Coffers or Urborg which ever half you don't have, Academy Ruins for recursion or Nykthos
The announcement was made on December 16 and the update goes into effect immediately, impacting only a few play formats