Game mode idea: Sealed Deck Shop

What is Sealed Deck Shop?

That's simple, when every game starts about half the items will be randomly disable in the shops (same items for both teams). The idea of it is simple: to force players to adapt their builds when the best items aren't available or a component item is missing but the final item is still there. Example: you want to build Zhonya's which is available but rod is missing. Do you save up all that money you are going to need or do you build something which has components available?

This would probably work best in ARAM given the nature of that map, but would be a good experimentation place for SR since your item selection changes from game to game.