Thanos

: When Thanos comes into play it creates 10 4/4 Black Order tokens.When Thanos comes into play, it gains control of the Infinity gauntlet.
: When the Infinity gauntlet comes into play Thanos gains control of it. On Thanos turn it gains control of a Infinity stone at random.
: Thanos gets +5 attack for each Infinity Stone. When this Boss is defeated all players become Avengers and the Avengers win the game.