At 3rd level, you gain proficiency with all gaming sets. In addition, you can use a gaming set as a spellcasting focus for your bard spells.
Expertise in one set?
Double inspiration on gaming checks?
Starting a 3rd level, when a creature uses your bardic inspiration die on an ability check, attack roll, or saving throw, you can use a reaction to predict whether the number rolled on the inspiration will be odd or even.
If you are correct, the result is doubled before adding it to the creature's ability check, attack roll, or saving throw. If you are incorrect the number is instead subtracted from the creature's ability check, attack roll, or saving throw.
Not really liking this so far
maybe deal damage to bard on incorrect guess
Starting at 3rd level, when you cast a bard spell while holding a gaming set, you can use it to enhance the spell's effects. You expend one use of your Bardic Inspiration, roll the die, and consult the table below to determine the effect.
The motions you perform for this feature depend upon the gaming set used. For example, you could be drawing cards, rolling dice or flipping coins.
roll any number of d20s (likely linke to spell slots or uses of inspiration)
Getting pairs, three-of-a kind, straights etc. grants bonuses
High Roll. Choose the highest number you rolled,
Group. Choose the largest group of dice with the same number,
Straight. Choose the longest unbroken chain of consecutive numbers (such as 2,3,4,5),
One Pair. If you have two dice with the same number
Two Pair. If you have two pairs of dice that each share the same number,
Three of a Kind. If you have three dice of the same number,
Straight. If you have five dice with consecutive numbers (such as 2,3,4,5,6),
Full House.
Four of a Kind