These are cards that are only available at certain events
There are certainly some themes present in this expansion, but because of the sixteen games in the series, it feels like the cards are all designed to do various weird and unique things, at the cost of them being rather weak in power level
Pull any of these chase cards yourself
This can help you accumulate the cost needed for Hyper Beam, which does 50 damage and lets you flip a coin to see if you can discard one of your opponents Energy cards.
If you bring a creature to the battlefield during the opponent's turn (for example, Teferi Mage of Zhalfir), and the cunning opponent phase it out, Teferi will phase in at the beginning of your untap step, and you can attack with it during the same turn
The singles market may be impacted by the greater degree of trial-and-error, and folks will be less likely to splash out on expensive decks that they havent tested to death with Pixelborn