Silver bullet

A silver bullet is a specific solution card. It is incredibly powerful against a certain type of card or archetype, but useless or inefficient otherwise. An example of a silver bullet is <c>Moat</c> because it stops almost all creatures but is useless against flying creatures and decks that do not use creatures to win (such as Burn, Combo and their variants). A hoser is a particular subtype of silver bullet. 
The term is used fairly widely depending on the situation. If your deck only contains one answer to a certain situation, then that card is your silver bullet. If there are many cards in a format that significantly damage specific decks but one is significantly better, then that is a silver bullet. Often these cards find a place in side boards as a meta-game choice or as a wishboard.
Category:Magic slang