I've seen many different mash-ups of the big three horror icons in the past, with most of them coming off fairly cheesy. This one takes the cake as one of the most badass I've seen to date. Talk about an (un)holy trinity!
The artist is Anthony Petrie and I suggest you check out more of his incredible art over at his website. Keep your eyes peeled for a Masters Of The Universe/Thundercats piece that will blow your goddamn socks off!