Instant, 2UU (4) Counter target instant or sorcery spell. Search its controller's graveyard, hand, and library for all cards with the same name as that spell and remove them from the game. That player then shuffles his or her library.
Illus. Shishizaru
10/4/2004: It removes the countered spell from the game. This is because the first sentence puts the spell into the graveyard before you continue to the second sentence.
10/4/2004: If the spell is not countered (because the spell it targets can't be countered), then it does not get removed from the game but all the other copies in the graveyard, hand, and library are removed.
2/1/2005: Quash can remove cards even if the spell countered was a copy of a spell. For example, if you Quash a Boomerang played from an Isochron Scepter, you may search for and remove cards named Boomerang.
2/1/2005: If Quash counters a spell that has had text spliced onto it, only the base spell may be removed. For example, if you use Quash to counter a Kodama's Might with a Glacial Ray spliced onto it, you may search for and remove only Kodama's Might.
2/1/2005: The copies must be found if they are in publicly viewable zones. Finding copies while searching private zones is optional.
Betrayers of Kamigawa
(Uncommon)