Previous Versions can be found here.
Break was an Integrity spell. When used, it allowed you to send one of the cards on your board back to your hand, just like Doggo.
However, Break was not only free, it would also give you 20% of the monster's cost in gold (rounded down), meaning that you would earn 1G when used on a 5-9G monster, 2G when used in a 10-14G monster and so on.
This resets their stats, so it was best used when one wished to gain more monsters through the Magic effects of cards like So Sorry, Alphys or Onion San, returning and replacing mid-priced silenced monsters such as Mad Dummy or Sans as well as recovering and/or reusing powerful monsters like Papyrus, Undyne or Asriel Dreemurr.
As of Beta 70.1, this card has been removed from the game.