Marvel Heroes, since the game is running its Lucky & Legendary Weekend in celebration. And what does that boil down to? Why, it means you have a lot of options to get lucky with legendary items in (potentially) legendary ways. You might need to get a bit lucky to get everything you want, though.
The biggest element of the weekend event is crafting the legendary Pot of Gold, crafted with dropped pieces of rainbows that can be found during the event. There's also a new random costume case that allows for a chance at all sorts of different outfits for your heroes and a game-wide reworking of drops to be more festive for the duration of the weekend. So if you feel like staying up all night to get lucky in the game, you've at least got some convenient reasons for doing so.