Accelerator

All sorcery spells you can cast also have flash.
Permanents you control that have sorcery speed
abilities may be used at instant speed.
Rumor has it that Fendrok the Slow labored on this
curious device for over a decade. While it cost him
two fingers and his beard never grew back in one spot,
he never lost a duel again. Sturdily built, it was
equally useful for whapping cutpurses over the head.