Royal Karnage by Magic Dream

It's much more than just a small packet trick that you get. It's a complete routine with a real story to tell your audience. 

Cannibalism comes to your table! 

Two chosen cards are eaten by the four cannibal kings: Bicycle cards with blue backs become as red as blood, and the little angels on the back of the cards have been devoured (there is a hole in their place!). 

You finish the routine by showing that The 4 kings have turned into scary crowned skeletons. The Kings have devoured each other!