The "heist" mechanic has a disproportionate effect on game play, and should not be adopted in future cards.

The person using it gets to view the entire deck of their opponent. They get to choose the best card for their specific situation at that time, which is a mechanic not available but for limited decks and colors. That person then gets to cast that card without any regard to the mana color required, which after the first two points is minor. But it ruins game play, and should not be adopted for future releases.