Hey Blizz, I had a fun idea for a weekend event or w/e.
A player queues for Treasure Goblin Mode, and is able to “invade” the game of other players or parties. The Treasure Goblin player’s objective is to use portals and other goblin-like special abilities to make it to a certain location on the map and escape. The other players, of course, want to kill the Treasure Goblin player and get the loot that will inevitably drop. The player gets some consolation prize for queueing as the goblin even if they lose, but more if they successfully escape. This reward must be transferrable to the queueing player’s main character, or account in general. Otherwise, no one would queue.