All the Items gamemode

Okay, so this is just a simple idea that I'm throwing out there to see what people think of it.

How about a featured gamemode where you play on Summoner's Rift, just a normal game... and all the items in the game are available?

After all, Riot say that they are using these gamemodes to test the playerbase (not sure how much they get out of it, but oh well), so why not test how items designed for other maps work in an ordinary game? Will tanks buy Odyn's Veil? Will ADC's combine Bloodthirster with Sanguine Blade? Will Yasuo buy Lightbringer? (Okay, so maybe you shouldn't include Lord Van Damm's Pillager, considering it is essentially and Infinity Edge pre-nerf...) Heck, if some items turn out to be used in a way that doesn't destroy the balance but people enjoy, they could even be imported to the actual Summoner's Rift. And besides, I doubt creating a gamemode that just has all the items in the game would take very long, and it might even be fun just for variety.

Nothing spectacular, just a thought I wanted to throw out there to see what people think.