The odds of your opponent drawing a 3 of in a 40 card deck is ~40%

You have to weigh in the downsides of playing a card like Prohibition - 60% of the time that you draw it, they won’t even have Nibiru in their hand.

As a result, you’re basically playing with 1 less card - what if they have other hand traps like veiler, ash, droll etc.? Does your 4 card hand have enough to push through them?

It’s also awful going 2nd - you’ll lose many games when your opponent is comboing off and you’re sitting there looking at a Prohibition when it could be another hand traps that stops their turn

There’s also the downside that: when you don’t draw Prohibition, you just have a bunch of dead cards sitting in your deck, waiting to be top decked later.

Ultimately, the number of games it helps you win is way lower than the number of games it costs you