Comment by PeterisP

I think that it's not possible to normalize a single 'deck quality' score as the effectiveness of the deck depends on its opponents, you can have a deck that's good against some decks and weak against others in an intransitive manner; so the deck quality is conditional on the frequency of other decks in the 'competitor pool' i.e. the metagame. Game theory states that if there is not a single dominant deck (and I think that there would not in MtG) then there should be a Nash equilibrium of mixed strategies e.g. I pull out deck A with x% probability and deck B with y% probability, but with MtG rules that likely involves a distribution of many decks with different counterstrategies and counter-counter-strategies.