Curse of fragility

The tool has a random chance to break based on its durability.

Let's say durability is constrained in range 0 <= D <= 1. The basic linear chance would then be (1-D). Then a growth function could be added on top (e.g. chance f D = f(1-D), chance (**2) would be (1-D)^2), so that the chance is configured for developers/item specifically.

Leveled curse of vanishing

(lower effects add to the higher ones)

The current curse of vanishing: player dies - item disappears.
If an item is dropped in general, it disappears. // note: it can still be placed inside of item frames, etc.
a) If an item is armor and is taken off, it disappears.
b) If an item is placed inside of a storage unit, and then the storage unit is closed, it disappears. (it disappears from item frames immediately)
If an item's slot is changed after it was transferred to the player, it disappears.
It disappears [e.g if you enchant in the nchanting table, there's no output and the input is gone]

Curse of illusion

The item in an inventory shows as being swapped with a random slot, picking the wrong slot will take the actual item in there and shuffle the item with a curse with another slot.

Curse of shapeshifting

The item mimics another item, by its texture and description. It acts, however, like it normally is.

Curse of insignificance

The objects containing the item behave like the item does not exist: The item shows up invisible, only becomes visible when you pick it up (LMB), when you place it it is only visible until hover is lost (allows you to read the item description). When a visible item is placed on that slot, the invisible item is destroyed and never seen again. When thrown out, only the item shadow is shown.

Curse of binding variations

a) when an item is placed into any slot, it cannot be removed or moved anywhere else (unless the parent is destroyed obviously)
b) when a slot containing the said item is focused on a hotbar, it cannot be unfocused and the item cannot be moved [optional: except to offhand]

Unknown curse

Basically one of the curses but with the name hidden.