Broken

The term "Broken" is used to refer to any card that is considered to be overpowered, giving the user a significant advantage, and usually resulting in a great win.

The term is purely subjective. Many cards considered "Broken" are typically Forbidden in the Advanced Format, although some cards may have to wait before they can be considered broken; usually, this takes place during the addition of newer cards, opening new strategies and Deck types to players. Also, some cards that are considered to be "broken" may only be so overpowered due to some kind of card combo that utilizes the card's effects to their maximum potential; sometimes, when used outside of that combo, said card may not fare as well as it would if it was in the combo.