Character art by Johnny O'Neal.
Background art by David Nyari.
The discard is a cost that must be paid toward the ability, and another discard effect cannot be used to pay this cost.
A card that works well with other cards that allow a player access to Room cards, either from the Room Deck, or the discard pile. This card is helpful for ridding a player's hand of unwanted Monster Room cards, especially later in a game when a player is more likely to have found a decent dungeon set up, and no longer needs other Monster Rooms to help build the dungeon, and needs more Spell Cards than Room Cards to help deal with Epic Heroes.
"Witches, warlocks, and other dark magicians are often more than happy to sell their services to the highest bidding Boss Monster. Besides using their powers to attack invading heroes, they also serve as field generals and even mini-bosses within the dungeons themselves."
-Excerpt from the Strategy Guide
The effect on this card seem to imply that the witch cooks monsters to turn them into magic.