Chaotic Hex

You curse a creature that you can see within 30 feet of you, and that creature must succeed on a Wisdom saving throw or become cursed for the duration of the spell. 

While the spell is active, on each turn roll a d20 to determine the effect.

1. On the next attack the target receives, the target takes minimum damage of the damage dice.
2. The target's skin turns into a shade of color of the player's choice.
3. A musical fanfare is played any time the target is successfully hit during an attack for the remainder of the spell.
4. An invisible bird defecates on the target's head.
5. Until the start of your next turn the target's clothing turns into a costume of the DM's choice. No affect on target's AC, movement, spell casting or attacks.
6. Until the start of your next turn, the target speaks in a high pitched squeaky voice or a silly voice of the DM's choosing.
7. Until the start of your next turn, the target will skip/prance whenever it moves. No affect on movement rate. If underwater or flying the target imitates the same movement with the rate unaffected.
8. Until the start of your next turn, upon use the target's weapon transforms into a toy version of itself which makes silly noises. No affect to attack roll, spell casting or damage.
9. Nothing happens
10. The Target uses their reaction to let out a very loud belch.
11. You are healed the same amount of damage inflicted on the target on the next successful attack against the target
12. The target has disadvantage on saving throws for the next spell cast upon it.
13. The target has disadvantage on their next attack.
14. Until the end of the your next turn, the target subtracts 1d4 from their attack rolls and saving throws
15. Until the end of your next turn, the target has -3 to its AC.
16. The next attack against the target has advantage
17. The target turns into a kitten until the start of your next turn. While a kitten, the target has one hit point. If the target drops to 0 hit points, the target's form reverts.
18. The target is vulnerable to bludgeoning and piercing damage until the end of your next turn.
19. The target can't speak until the start of your next turn. Whenever the target tries, pink bubbles float out of their mouth.
20. The next successful attack against the target is considered a critical hit. The target takes the maximum damage of the damage dice (including modifier spells such as hex) as a result of the attack.