Are these goals impossible? A perfectly balanced game?
Imagine each card has a number that is an abstract representation of how useful it is, similar to a war game. Let's call it "library points" . For example, keywords and monster stats determine the LP.
Players agree in a number of library points and build their decks. Library has to be under the library points limit.
Goals:
No power creep. A 45 LP card from the first set has the same usefulness as a 45 LP card from the newest set.
Formats are NOT based on card pools or recent sets. No set rotation. No set is more powerful than any other. Your old deck is still as powerful as a new one because the Library points are the same.
"Commanders" are optional, not tied to a format. A big personality or leader card that is supposed to stay in play and have your whole deck built around it. If you don't have one, just use those points in the rest of your library.
Potential problems:
Adding new keywords or abilities will probably ruin the calculus for card value, and you can't retroactively adjust how much a card is worth.
It might be impossible to assign meaningful numbers to the cards without dumbing it down the simplest abilities or making it extremely reliant on established keywords and the card design becomes bland. (" oh boy another monster with trample and stab")
If you screw up the calculations, you're fucked. In a tcg, you can't change the card design. (The power 9 should have never been printed)
Sales: less likely to sell product if the new set isn't any better than the old one. (Fuck consumerism anyway)