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Vadmir, New Blood is a Rare, Legendary Creature - Vampire Rogue card from the Magic The Gathering set Outlaws of Thunder Junction (MTGSC-OTJ-0113)
For The Lost Caverns of Ixalan, four of the sets Commander-exclusive cards came to MTG Arena
Meaning, you can't just shortcut it and have to play it out, making 20 minute turns that aren't guaranteed to win

These are the important cards you are looking for: Ways to get big creatures into the graveyard - Entomb, Bone Shards, Bitter Triumph, Liliana of the Veil, Frantic Search, Collective Brutality, Jace Vryns Prodigy, Faithless Looting, Psychic Frog, Malcolm Alluring Scoundrel, Thirst for Discovery Ways to bring them back into play - Reanimate, Exhume, Animate Dead, Persist, Necromancy, Recurring Nightmare, Unburial Rites, Life/Death, Emperor of Bones Tutors and card selection to find your missing pieces - Vampiric Tutor, Mystical Tutor, Demonic Tutor, Wishclav Talisman (this one is quite risky though and is more of a Storm card where you can usually win in the same turn), Brainstorm, Ponder, Preordain, Nights Whisper Discard spells to clear the way - Thoughtseize, Inquisition of Kozilek, Duress And finally, the big creatures to reanimate - Archon of Cruelty, Griselbrand, Atraxa Grand Unifier, Etali Primal Conqueror, Woodfall Primus, Myr Battlesphere, Triplicate Titan, Sundering Titan