In my own testing, I have found the 61st and 62nd cards to be negligible but others disagree
Even though Mine stomps the slower interactive decks, Infect, Burn, and even Tron could care less about the extra cards and would often leverage free cards pulled early into an insurmountable advantage
But the Commander set didnt give us any White or Boros spells that made halving life possible and Scytheclaw was in a different preconstructed deck
Most Commander decks go rather late, so Valakut Exploration is a great option most of the time
These cards are classy and would make a great full-set collector's item, but given that they're only for rare or mythic rare Heroes and Villains, they're going to be difficult to find in packs without having to buy some as singles
Its very unlikely that you will be able to take home a deck or buy anything