Luck Domain

(WARNING: This is my most broken/OP Cleric Sub-class. If you are a DM who is considering allowing this monstrosity then I urge you to please think about it first. This WILL break your game. To give an example, its like you are playing Uno and you have a full hand of "Draw 4" wild cards. I'm posting this because it is a fun sub-class, so if your the kind of DM that allows something like I Don't know the "Deck of Many Things" for example, then yeah I think you will have a lot of fun with a player using this. Otherwise I wouldn't even consider)

A cleric that worships the god of luck. These clerics believe that luck is all you need and thus place their well-being in the hands of fate. 

Bonus Cantrip: Guidance

Starting at 1st level, you gain a cantrip "Guidance"

Blessing of Luck

Starting at 1st level, you gain advantage on all Stealth, Sleight of Hand, Performance, Animal Handling, Perception, Acrobatics, Persuasion, Survival, Medicine, Deception, and Investigation checks

Channel Divinity: Lucky Dog

Starting at 2nd level, As a reaction, you can channel your divinity to bless your self with luck. When every you fail a roll you can re-roll your rolls for that roll (Including any advantages you had) with double proficiency with any of the rolls that used your proficiency. If you fail the roll a second time then add a bonus of 5 to the highest rolls and if it still fails after all that then Oh Well.

Rabbit's Foot

Starting at 6th level, you gain advantage for all saving throws. If the save already had advantage then you gain additional advantage for that save. (Instead of rolling 2 die you roll 3 and take the highest)

Treasure Trove

Starting at 8th level, you gain advantage on obtaining and/or finding treasure and loot from a loot and/or treasure table. (What ever your DM uses to decide if you find and what you find, you now have advantage on)

Cheating Death

Starting at 17th level, your death save count is increased to 6 and your saves are decreased to 1. (Meaning in order to die you would have to fail a death save 6 times in a row and you just need 1 save to stabilize)