These cards were printed by manufacturers to check how new frames, colors, foiling, or other technical features would look before a real set released
Perhaps Wizards is banking on Fatal Push picking up the Delver slack
Theres not a ton of playable cards with cycling synergies
It's also worth keeping in mind that Ashiok, Dream Render can be good against some Field of the Dead decks since it shuts down our opponent's ability to search their library for lands with cards like Golos, Tireless Pilgrim or Circuitous Route
We thought it would be more practical if the frame displayed the colors of the card (well, at least for two-color cards
Read your Pokemon cards, and their movesets and abilities, carefully when building your deck and going into battle