Feature Gamemode Concept: Build for your Friends

I was just thinking about unique gamemodes that could work in League. With the Black Market Brawlers mode being on the PBE I feel like Riot has run out of fun ideas(as I'm personally not a fan of it at all from what I've seen). So here is a unique one that is mostly flawless, with trolls being just about as impactful as they are in normal games. This was difficult for me because when I originally thought of this idea it was too easy to troll your team. But now I have come up with a system that works.

So the game is played on the Summoners Rift, and it will be played blind or draft pick, I do not know which one would be better. So essentially the game goes like so: You can open the store and click on items that you want. You don't get them, but now your team can buy them for you. You buy items for your team that they chose as well, with your gold. That is all that there is to the game.

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Specifics - read only if you really need to know how the game will be played and handled: Free trinkets can be bought normally. The rest of your normal shop is where you queue up the items you want, or remove things from your queue that you don't want anymore, which you must do at the fountain. Then there will be a new place for four icons in the shop; the place where you buy your teammates items, also at the fountain. The items are bought with the gold you have gotten from playing the game yourself. When you buy something for someone they will be notified of the occurrence. You can queue up complete items or smaller ones. You can buy items for your teammates that build into items they have queued, if no one has bought the item for them already. YOU CAN'T BUILD ONE PERSON MORE THAN 3500 GOLD ABOVE EVERYONE ELSE ON YOUR TEAM. Items that make someone exceed this limit will be disabled from that person's queue until everyone has caught up. If you wish to sell an item, the gold will be given to person(s) who bought the item. YOU CAN'T BUY ITEMS FOR SOMEONE WHEN THEY ARE IN COMBAT. If you wish to buy a teammate an item, notify them so that they may leave combat. (I don't know how long it should be to be considered "out of combat")

Those are just things that prevent you from abusing the system.

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I could go into more detail, but I think you get the general idea. Thoughts?