Marvel Super Heroes stickers are now available in WeChat Sticker Shop. For the initial release (22nd April 2014) till 29th April 2014, it will be available free of charge. After 29th April 2014, you have to pay S$1.28 to purchase it!
Oh and the stickers are animated!
If you are not on WeChat yet, it is time for you to download it! WeChat is available on almost all platforms  and of course including WeChat on iOS , WeChat on Android  and WeChat on Windows Phone .