The only drawback is that it wont last for long at the early game, but it is a huge card at mid late games, and at turn 3 or 4 it can slow down an aggro deck
Then as your vehicles deal combat damage to your foes, you exile that many cards from their library and you can play them, although there is no mana-washing here, so in a mono-Blue deck you might find it rough to cast non-Blue, non-colorless cards
Her first ability, Unquestionable Wisdom , is a great tool for token decks that want to swing out with everything and still have blockers open, while Hunt for Heresy's role is to get those death triggers many other cards in the deck need to function
Iron Hands exs Amp You Very Much attack deals 120 damage
Jace has the ability to mess with people's memories