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It doesn't seem like there is, but some people who use mantras still believe that mantras help them win the gamble. But if they lose the gamble in the end, maybe they will think it was their bad day so the mantra doesn't work optimally. The use of spells or not will depend on how one's habit of gambling is but it will not change the outcome of using mantras if indeed they are not lucky enough to win the gamble.
Exactly, there's exactly no mantras or spells existing or at least was proven to be useful in gambling activities. Mantras or spells are created by a human with hopes and beliefs that it could help them win while they gamble but often times, it won't guarantee you winnings as losses are unavoidable especially when it comes to gambling because that's already part of the equation and risks. Might as well use these kinds of things to help the gambler ease the intensity they are feeling and make them comfortable, but hoping to win? I'm afraid that is not possible.
Although I admit what you say is true that whatever spells we use will not affect the gambling activities we do. Because the victory
we get when gambling, it all depends on each of us luck, and luck has nothing to do with spells. But there is no prohibition either
when gambling we believe spells can affect gambling activities, so in the end it comes back to ourselves. We just do what we really
believe, and think we are right. We should be able to respect other people's opinions if there are people who believe that spells
can make them lucky when gambling, most importantly he does not impose on others what he believes.