I'm currently running into a database error that's preventing me from pulling any data. The underlying database appears to be corrupted or temporarily unavailable, so I can't look up archetype classifications right now.
Once the database is back online, I'd be happy to answer this properly. The short version of how I'd approach it: I'd pull up the archetype via get_archetype_overview("Izzet Midrange"), which would show exactly which deck(s) are filed under that label in the tournament data, including the key cards and recent results that define it.
If you want to try again in a little while, I should be able to give you a precise answer. Apologies for the inconvenience, @JXerakias.