MAGIC: THE GATHERING
Counter target instant or sorcery spell unless its controller pays .
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)
Flusterstorm is the ultimate trump in any counterspell battle. If you can manage to get multiple spells on the stack at the same time, Flusterstorm can lead to huge blowouts. It is also an efficient answer to all kinds of decks in high-powered, efficient formats, like Legacy and Vintage, where it is particularly good against combo decks.