Add extra functionality to the cleric

Minecraft in its version 1.11 added some enchantments called curses that instead of helping us ruined the objects. Now I come with an idea that would be great but for that they would need to do two things:

1- Add more curses (Post about curses :https://feedback.minecraft.net/hc/en-us/community/posts/360018787971-Additional-Curses-was-CURSES-).
2- Change one of the cleric's tradeos.

To unlock this trade you have to raise the level of the villager to Expert. Then spend a minimum amount of 15 emerald + the object has "bless", the price multiplied by 0.5 and blocked the second use.