Minecraft wiki entry for Potion, associated text: The potion of Luck‌[JE only] and the potion of Decay‌[BE only] cannot be brewed. A potion of luck can be obtained via commands such as /give @s minecraft:potion{Potion:luck}, while a potion of Decay can be obtained via /give @s potion 1 36. Both are also available through the creative inventory.