Lucky Gambler (3.5e Feat)
From D&D Wiki
Lucky Gambler [General]
You've got a natural talent when it comes to games of chance.
Benefit: You gain a +4 luck bonus to ability checks involving gambling - that is, games involving betting. The +4 bonus also applies to flat d20 checks made on bets which you have no control of the outcome, for example betting on a race you have no influence on.