Suggestion for a new item.
 

What if in League of Legends there was an item that gave you an extra item slot? I think this would be a very useful item and could add more complexity to builds. As for it's cost it would probably be about 1500 gold. You can buy as many as you want and they add +1 item slot. Thoughts?

No. The game is balanced around scaling tapering off due to 6 item slots.

And also, you worded it so that it sounds like you're filling an item slot with an item slot, in other words wasting 1500 gold to do nothing unless you meant to say "spend 1500 gold to get an extra item slot" in which case my first statement applies.

There needs to be energy support. There's no item to help the Ninja's regain their easily spammed sustain.