Gambler

You love gambling and you will live and die by chance. You have learned how to use this to you advantage when defending yourself, as you often have to do with the bets you have lost and rigged. 

Double or Nothing

Before rolling for an attack you can choose to impose disadvantage on yourself for the chance to deal twice as much damage if you hit. Stacks with critical strikes. You can also double disadvantage if you already have disadvantage and roll three dice and take the lowest roll.

Rigged Gamble

You have learned how to rig your own gamble. You can choose to sacrifice any amount of attacks (only attacks that are part of your action) to not recieve the disadvantage aspect of Double or Nothing class feature for an equal amount of attacks. For example, if you choose to sacrifice one of your exrta attacks you can use your Double or Nothing feature for one attack. If you are lvl 11 and choose to sacrifice all three of your attacks from your action on your next turn you can use your Double or Nothing feature three times without disadvantage. 

Critical Point

When you are hit with a critical melee strike you can choose to roll a d20. If you roll an 11 or higher you remove the doubling effect of the critical strike ( it does not remove an class abilities related to a critical such as a barbarians brutal critical dice). If you roll a 10 or lower the attacker gets to add an additional damage dice which is also doubled.

High Risk High Reward

You know crit on an 18-20 however you critically fail on a 1-5.

Lucky Gambler

At the start of each dawn you roll 1d4-1 (minimum of 1) and gain that many luck points. If you have the Lucky feat already you only gain half of 1d4 (minimum of 1 rounded up). These luck points do not carry over into the following dawn and you must reroll at each new dawn.