If your opponent controls 2 or more monsters than you do: They can send any number of monsters they control to the GY, after which you apply the following effect based on the number of monsters your opponent controls.
●0: Your LP becomes halved.
●1: Your opponent gains 2000 LP.
●2: Banish all cards in your opponent's hand face-up, until the End Phase.
●3+: Your opponent cannot activate monster effects this turn.
You can only activate 1 "Vesper Girsu" per turn.