Once per Duel, if your opponent controls 3 monsters, discard 1 card, then destroy all monsters your opponent controls, also for the rest of this turn, any damage your opponent takes is halved.
Set:
Speed Duel: Streets of Battle City
Once per Duel, if your opponent controls 3 monsters, discard 1 card, then destroy all monsters your opponent controls, also for the rest of this turn, any damage your opponent takes is halved.
