They feature a mix of yellow card borders and holo gray borders, since we're currently between the Sword & Shield and Scarlet & Violet eras
I like testing on Magic Online because I get to play matches against a variety of decks and can quickly learn which cards I always side out, which cards I always side in, and which cards I never use in my sideboard
Izzy handled the artwork, and the card originally shipped in Arcane Maelstrom, the Temur deck led by Kalamax, the Stormsire
Not every holographic card was made equal, with some Gyarados and Hitmonchan appearing in theme decks, this meant you could open two boxes to yourself and still not pull a Charizard and the main point is back in the day the demand far outweighed the supply, so who could get their hands on multiple boxes let alone multiple packs
It's not uncommon to pay just two or three mana to cast Blasphemous Act in multiplayer Commander games