Those are among the best cards in Standard right now, and time and again in Minneapolis I watched players reliant on mana dorks and hexproof creatures get massacred by the savvy Wolf Run pilots
While you can only spend the mana on an equipment spell or to activate an equip ability, its still pretty darn monumental to see a one mana red mana dork
Pikachu is well-known as one of the cutest electric type Pokmon, so it's no surprise that the versions of the Pikachu Topsun card with print errors are so valuable
Both Porygon-Z cards are very good, with annoying and disruptive attacks, and being able to get there on turn 2 makes those decks much more consistent without needing to rely on Rare Candy
All these options are great in different scenarios, whether youre looking to survive a board wipe, push some damage through, or swing out with an alpha strike