I know a lot of people are voting Joseph, but Jacob is the far superior hero.
Play first means CTB, PBI, Search, all without the need for HT taking up an artifact slot. Band to any silver is insane at this point in the game. Honestly, think about how many top decks (regardless of type) make use of Joseph. Now do the same for Jacob.
Jacob goes in more decks, has more uses, and still has great support. Joseph makes some cards CBN (not even the best battlewinners) and has great numbers, but he has nothing on the power that Jacob has.