Luckily, most of the Magic: The Gathering cards with the scariest artwork are based in fiction, or maybe in nightmares someone has had
True grails (1st Edition Base Set Charizard PSA 10, low-pop vintage in high grades) holding strong
Energy Search Pro (176/191) A card that feels tailor made for the introduction, and rise, of Stellar Pokmon, Energy Search Pro allows players to search their deck for any number of Basic Energy cards of different types, reveal them and put them in their hand, before shuffling their deck
Trophy cards typically have 3-20 copies, while promotional cards like Snap Magikarp had only 20 copies per design
Card marking is illegal in competitive play because it gives you an unfair advantage over your opponent