A little idea that floroushied to the back of my mind was creating a champion that used his gold as a main mecanic.

Here goes :

Name : Wallace (provisional)
Attack type : Melee
Lanes : Top (main), Jungle or Support

[Passive] Greed : Wallace gains attack damage equivalent to 0,25% of his total gold gained through the game.

[Q] Money Shot : Wallace shoots a pouch of money at the enemy in a straight line. Upon impact, the pouch explodes, dealing physical damage and slowing the targets by 30% for 2 seconds. In the explosion, every enemy hit drops a coin that can be collected by anyone (10 gold for a minion hit, 20 for a champion hit, gain is halved if collected by the opponent).

[W] (no name) : Aura : Gold per 10 aura (3.0/3.5/4.0/4.5/5.0)
Active : Wallace gains a shield equal to 20% of his current gold (a cap would be required).

[E] (no name) : Wallace dashes in a given direction. If it is towards an opponent, he gains armor and magic resist. If he tries to escape, he gains 20% movement speed for 2 seconds.

[R] Chest of Corruption : Wallace places a decoy chest that taunts enemies for 2 seconds. Afterwards, the chest explodes, dealing more damage depending on the distance separating them from the chest. (Can be something else than a chest)

Note : 0,25% of total gold would make a 20 000 total end-game gold value for 50 extra attack damage.

What do you think of it?