This is specifically looking at the legacy format, in which Skullclamp is banned, thats the same reason that Jace is where he is. Many slow blue decks in Legacy

This is specifically looking at the legacy format, in which Skullclamp is banned, thats the same reason that Jace is where he is. Many slow blue decks in Legacy want to play Jace, but that is not an overwhelmingly huge set of decks.