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They may specifically reference sacrificed permanents, like Mayhem Devil, or just trigger when creatures die, like Blood Artist and Homicide Investigator
Like most Magic: The Gathering cards, the value of Bloodmad Vampire depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The List)
The user Lord-Nagafen then cites the Charizard VStar card from the Pokmon TCG: Sword and Shield Black Star Promos , whose artwork features Charizard battling Mewtwo

Gallery and List of Craft Cards Clay-Fired Bricks / Cosmium Kiln Oteclan Landmark / Oteclan Levitator Spring-Loaded Sawblades / Bladewheel Chariot Unstable Glyphbridge / Sandswirl Wanderglyph Braided Net / Braided Quipu Inverted Iceberg / Iceberg Titan Lodestone Needle / Guidestone Compass The Enigma Jewel / Locus of Enlightenment Waterlogged Hulk / Watertight Gondola Altar of the Wretched / Wretched Bonemass Tithing Blade / Consuming Sepulcher Visage of Dread / Dread Osseosaur Dire Flail / Dire Blunderbuss Idol of the Deep King / Sovereign's Macuahuitl Ore-Rich Stalactite / Cosmium Catalyst Saheeli's Lattice / Mastercraft Raptor Jade Seedstones / Jadeheart Attendant Kaslem's Stonetree / Kaslem's Strider Master's Guide-Mural / Master's Manufactory Tetzin, Gnome Champion / The Golden-Gear Colossus Throne of the Grim Captain / The Grim Captain Eye of Ojer Taq / Apex Observatory Paleontologist's Pick-Axe / Dinosaur Headdress Sunbird Standard / Sunbird Effigy Best Craft Cards #9

Get ready to catch 'em all with this electrifying cake design