UPDATE: I have now decided on what each Mr bones variant should do.
Dr.Bones: His ability should be where you can modify one joker after losing a stake. This card would only last until you lose a stake
Dad.Bones: this card gives you the Dad Of The Year badge which is placed on a joker that you choose. This badge/sticker would allow you to buy Dads payroll (a new joker card) that allows you to gain +2 money and +1 mult per round, but if you buy something in the shop the badge would deactivate making Dad's payroll card useless. (Note that after losing a stake the dad.bones will be destroyed and gives you the badge and a second life, also after buying something in the shop, the badge and dad's payroll joker will be destroyed.)
Joe.bones: (this would be a legendary joker not a rare.) This card will allow you to stay alive after losing multiple stakes but if you have no more money then joe.bones will be destroyed but you get to choose what other legendary joker you want (note that you can only obtain one legendary joker but having to pick from 1-3 legendary jokers)
Corrupt.bones: this joker activates after losing, the effect is unknown. Meaning that it could either destroy or add jokers or it could reset your balance or your hand levels. It is a risk card. It gets destroyed after losing a stake.
The last Mr.bones joker variant: Dev.bones: this joker would give you the dev card, the dev card is a one time use card. Allowing you to choose to add extra lives, add extra money, add extra joker slots and add the developer coin. The add money, joker slots and lives would have a random quantity (Up to 20 cash, up to 5 lives and up to 5 extra joker slots) you would be given a slot machine to spin that if you get a row of: money, lives or joker slots you would be given a random amount of money or lives or jokers. It is pure luck and chance to get a high quantity on lives and joker slots.
The Dev coin would activate after winning a run. This will give you the Dev Stake.