The short answer, really to my amazement, was that they broke expectation in a pretty significant way
Pick Your Poison At just 1 mana, Pick Your Poison offers surprising flexibility and disruption, forcing each opponent to sacrifice whichever permanent typeartifact, enchantment, or flierthat hurts most in the moment
However, as the sales page states that you'll receive a random tin, you won't be able to pick the promo you want (bah, humbug)
In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on