Magic: The Gathering - Ghoulies & Ghosties
"Skulking Ghost" and "Dungeon Shade" are completely unrelated cards, several years apart, with different illustrators and different creature types ("Ghost" and "Shade") but I'm lumping them together because...why not? They're both spooks. Or haunts. Or obake if you're so inclined.
I love the weird, pitiful quality of the Skulking Ghost, with its slimy intestinal-looking surface and long, winding fingers. The Dungeon Shade, on the other hand, is downright terrifying, and calls to mind the illustrations from the Scary Stories books.