Luck cycle

You have inexplicable luck that seems to kick in at just the right moment, but this innate luck comes with consequences that take a toll. You have 2 charges of this luck. before you make an attack roll, an ability check, or a saving throw, you can spend one luck point to roll 1d6 + proficiency bonus and add it to your roll; however after you use one of these charges, the luck cycle kicks in and the next roll you make, you take -2 off of the roll. You regain your expended luck points when you finish a long rest.