Lady Luck

You have made a pact with a being who controls fate and the fortunes of others, specifically to grant you uncanny luck for your larcenous activity. This lady of luck doesn’t require treasure or power, but rather ask for your servitude in the afterlife, either temporarily or permanently. Some of these beings could be considered gods, but some are much older; the Raven Queen, Fortuna, the Fates, Tyche and Avandra are all likely candidates, depending on the warlock’s alignment and goals.

Lady Luck is Smiling

On your 1.st level, when Lady Luck accepts you as her protege, you learn the Guidance and True Strike cantrips. When you roll for creating the magic, and you roll 7 or higher on the d20, you can cast either spell as a bonus action, when you roll 13 or higher, you can cast True Strike without concentration, and Guidence with an extra range of 30ft. You gain proficiency in sleight of hands and two gaming setts, or expertise in one gaming set, plus you learn the Magic Stone cantrip, witch is what you can cast on your gaming set pieces, potentially weaponising them.

Pick a Piece

On your 6.st level, your Patron enchant your gaming set with extra powers. Whenever you finish a short rest, you can roll a d4 and add your proficiency bonus to your roll, to determin how many enhanced ards you have in your deck.

Blue piece: Allows you to add extra effect to your attack. You gain a number of extra d6 to your attack's damage. On a succesful hit you can roll a d20; if your roll 20 on your attack roll, you deal no extra damage, but you regain an expended spell slot.The damage bonus on the ability increses 3d6 on level 11, and 6d6 on level 14.

Red Piece: Allows your attack to deal extra AOE damage, and impares enemy movement speed untill the start of their next turn. The AOE damage and slow effect scales with your level. On level 6 it's 2d6 extra damage and slows the enemy movement speed by 10 ft. On level 11 the extra damage becomes 4d6 and the slow effect increses to 15 ft. On lvl 14 it reaches it's peak. Your extra damage become 6d6 and the and the slow effect increses to 20 ft.

Gold Piece: Deals extra damage and Stuns an enemy.  The damage and stun effect scales with your level. On level 6 it's 1d6 extra damage and forces a WISDOM Save on the target. On a failed save, your target is stunned for 1 round. On level 11 the extra damage becomes 2d6 and the stun duration becomes 1d4/2 rounds. On lvl 14 it reaches it's peak. Your extra damage become 3d6  and the stun duration becomes 1d4/2+1 rounds. 

When you use this feature, you need to roll a d4 to determin the color of your piece. On a roll of 4, you can choose the colour of your Piece.

Bountyful Luck

On 10.th level, you gain 1d4 luck points. Whenever you make an attack roll, ability check, or saving throw, you may spend 1 luck point to roll an additional d20. You can use this ability after the original roll, but before the outcome is revealed. You choose which of the d20s is used for the attack roll, ability check, or saving throw.

You can also spend one luck point when an attack roll is made against you. Roll a d20, and choose whether the attacker's roll uses their d20 roll or yours.

If multiple creatures use a luck point on the same roll, they cancel out, resulting in no additional dice.

You regain 1d4 luck points when you finish a short or long rest.

Master of Fate

When you reach 14.th level, your Patron allowes you to deepen the connection with your own luck.  "Pick a Piece" skill. Also once every short or long rest you roll a 2d4-s. Based on the number you rolled, on the first d4 you gain one of the following abilities:

Your first d4 determins:

1 - You can cast Blur without expending a spell slot.

2 - You can cast Dimension Door without expending a spell slot.

3 - You can cast Blink without expending a spell slot.

4 - You can choose the spell you want to cast (Blur / Dimension Door / Blink) and you can cast it as a bonus action without expending a spell slot.

Your second d4 determins how many times can you cast the spells without expanding a spellslot.

1-3 - One time.

4    - Two times