Many of the most expensive cards from Dominaria Remastered are cards that are already in high demand among players, cards like Force of Will, Sylvan Library, and Urza, Lord High Artificer
Now, that isn't close to what Charizard or some Pikachu cards sell for, but it's more than honorable for a creature as disrespected as Raichu is.
With 100 HP to start with, this means it'll probably get one massive hit in and then get KO'd immediately after, and not even two Potions will allow it to survive using Beat Punk twice
Whether or not thats effective compared to some of the more powerful decks is unknown, but players are certainly encouraged to bulk up their decks with new cards found in blind boosters
They are or will be supported by the Comprehensive Rules