Keep in mind this is just something that I made up in the last like 30 minutes. Also feel free to pick it apart
Passive: Five-Finger Discount: Whenever this champion hits with an ability a copy of a consumable in that champion's inventory is dropped on the ground somewhere between the two champions (a few units closer to the enemy to provide a risk for getting the reward) that is used automatically when this champion walks over the item (think zac's blobs but items) These items can be stomped out by the champion that dropped them by walking over them. If there are no consumables in the opposing champion's inventory then a small amount of gold is dropped instead (no gold is lost from the opponent). This has a 60 second cooldown. This passive can be picked up by anyone on your team.
Q: 'Pick'pocket: Short Range skillshot / low mana cost / Medium CD: On hitting a champion with this ability this champion reduces a random non consumable item's stats by a small percentage. X/X/X/X/X percent
W: Finders Keepers: Passive: Any stats that are reduced by this champion by abilities or items are added to a pool. This pool lasts for X seconds. This champion gains 10/20/30/40/50% of these stolen stats.
E: Cat and Mouse: Point Blank AOE / Medium mana cost / medium to large CD: This champion throws down a smoke grenade dealing small damage over time and stealthing this champion for 3 seconds. While stealthed this champion gains unit walking and 15% Movement speed. When this champion passes through an enemy champion or is hit by the smoke cloud he applies 'Pick'pocket to that champion. 'Pick'pocket can only apply to an enemy champion once every 15 seconds.
R: Fence: Medium Mana cost/ targeted ability that can only be used if there is an ally present / Large CD: This champion sells his stolen stats to a teammate and is paid in health. healed for 50/60/70 +.015 of total gold earned(because why not have a gold ratio in this game ;p) health per stolen stat. (so if he had ad, ap, movement speed, armor, MR, attack speed, cooldowns, mana, health, crit chance this champion would give all those stats to a teammate and had earned 10k gold the heal would be 850 points at Ult level 3)