Suggestion for exciting ground drops

I’ve been thinking about this idea for a long time. The core concept is that every rare item, unique item, or skill gem would have a very small chance to drop as an “unusual” version. These unusual versions would come with one to four extra modifiers of varying tiers, chosen from a special pool of modifiers that cannot be crafted or influenced in any way.
For example, a rare armour piece might drop with something like:
- 7% increased Armour
- +12 maximum Life
- 1% reduced Fire Damage taken
Or, for a very rare case, a Summon Skeletons gem could drop with modifiers such as:
- 2% increased Attack Speed
- 12% increased Movement Speed
- 4% of Physical Damage as extra Fire damage
- +1 Maximum Skeleton
The idea is that these unusual items would be extremely rare, with a huge variety of possible modifier combinations, so rare that you will only ever see a specific combination once in an entire league. And sometimes you’d get something so exciting, like a skill gem, that you'll want to create a whole new character and build around it.