Reasons listed in the article for why a card should have the acorn security stamp (or what would have been considered silver-border only) include: Cards that dont work within the black-border rules An element of cards matter that black border doesnt reference (flavor text, as an example) Cards that require interacting with people outside the game Cards that require a physical or vocal component Cards that reference a state external to the game (are they able to see something from their seat, for instance) Cards with some effects that just dont feel right in black border By marking each card in the set with either an acorn or the typical oval security stamp, WotC was able to make the set black border and offer up cards for Commander players (along with fans of Vintage and Legacy) while conveying some of the cards can only be played casually
$34.19 90 Days Low $37.00 Daily Low $46.40 Market Price Sometimes it just comes down to older cards not having the same restrictions as newer cards
As a result, cubes of this size are good for highly synergistic and even combo archetypes
For example, for Genetic Apex packs Charizard, Mewtwo, and Pikachu will contain different cards
"Feature Review, Magic: The Gathering"
Diablo Obedient Raven brings Amethyst the utility of Kuzco Wanted Llama where Chernabogs Followers would normally sit, but with an extra Diablo Shift target
