League of Hunger Games: Game Mode Concept

Basic rules of Hunger Games. Last man standing wins. Crystal Scar (Dominion Map). 10 player free for all. Everybody chooses a champion as per usual and two summoner spells. Everyone spawns in a circle around the center where the lightning buffs usually are. No items, no gold, nothing except for three levels. There are three crates in the middle of the circle, and there are crates scattered throughout the map. Crates take three auto attacks to break, and whoever breaks the crate receives an item. People fight, people die. Killing an enemy transfers all items to the champion that landed the killing blow. Only six items may be carried at a time. Killing an enemy gives no gold, just the items they carried. Summoner spells are one time use. All champions have greatly reduced vision range, perhaps half the normal distance? There is no passive health regen, and no lifesteal. All health gain comes from items or potions. No towers, no bases, no minions, no passive experience, Every two minutes an outside ring of the map is filled with poisonous gas that deals damage over time to any champion within it. When a champion dies, they become a spectator. Every five minutes however, they are all released onto the map as wolves, spread out around the outer edge. These wolves are controlled by the dead players. They are exactly the same as the lesser wolves on Summoner's Rift and can move and attack freely with the same restricted sight distance as the champions. They can be killed just as the normal wolves can, but they do not give health or gold when killed. They last until killed, or until two minutes have past at which point they all despawn until the next five minute mark. The center area is always visible to all players. List of items crates can drop:

As you can see this isn't an entirely completed concept, so please discuss some other aspects of this. Are certain characters overpowered in this game mode? Do changes need to be made to accommodate that? What if players don't start out with masteries, but crates can drop five mastery points that are spent in game? What if crates also drop ability points? Any other ideas?

This is my first post, so any feedback is helpful. Thanks! -Snerbopsi