Champion Concept: Sell/Purchase Item slot

Just a random idea, but what if there was a champion that had a passive that enabled them to sell an item slot in the mid game for a large amount of gold, limiting them to only 5 items, but an increased gold advantage. Then, during the late game, your champion has the ability to repurchase the sixth item slot for a larger sum of gold (or if an item slot wasn't sold, could purchase a seventh item slot). The champion would be centered on snowballing, using an early gold advantage to help take down the enemy team, then late game, use extra gold acquired through snowballing to gain back the sold item slot/or get a seventh item.

The champion would have a merchant style theme, but definitely not a swindler theme like twisted fate.

As of now, I imagine this champ as an AP mage that heavily relies on mana and early item spikes. The champion will either feed or carry. Also, there are several answers to questions you may have in the comments. feel free to check those out.

Looking for any feedback and additional ideas.

(I will continue updating this thread as my ideas come to fruition and i'm able to create a fully constructed set of abilities and lore)