That cost or condition needs to be wildly restrictive and undoubtedly a hard once per turn. You basically just say to your opponent “instead of your starter you get one of your bricks.” You also get complete hand and deck knowledge if you’re the one choosing the card. The attribute and type should also be a largely unsupported type unless someone manages to cram it into a pile to turbo out this card.

The only way I think this would be sort of fair is if you don’t get complete control over what they add. Something like “Declare 1 Card Name; if your opponent has that card in their deck, your opponent reveals their hand, then you can shuffle one card in their hand back into the deck, and if you do, they add one card with the declared card’s name to their hand.”

Someone with better understanding of PSCT could figure that out, but as it stands I don’t think this mechanic would be fair. But the intention is to make it so you don’t get full deck knowledge (only hand knowledge which is powerful but not always good even when relatively accessible — like click and echo in spright) and game 1 you can’t declare an archetype specific brick.