Coins 

Fortune (Flush) Your mask gains a number of charges equal to the amount of Coins in your party. When you or another creature within 30ft. of you is about to make an attack roll you can expend one charge of your mask as a reaction to replace the d20 roll with a coin flip. Heads- the attack hits, Tails- the attack misses. This replacement effect negates any advantage or disadvantage the attack roll may have had.

Additionally you may perform a one minute ritual to expend a charge and roll a d4 you can then give that many allies advantage on the first saving throw they make during the next hour.

Facility (of a kind) For the duration of the session you give your Harlequin allies a bonus to one skill you are proficient in equal to the number of different suits in the party, they also gain proficiency in one weapon type you are proficient with.