New Map Concept: Like ARAM but with Minions

Remember the old tower defense? Remember how fun it was to configure weird arrangements so you could hold off the ever increasing waves of minions? Why not give us a version like that for this game where 3-5 players game to "level up" items or upgrades. Call it Ornn's Last Stand and let us try to determine the best combination of items and champs to keep the Nexus alive.