Dreadhorde Arcanist is a special Creature — Zombie Wizard card from Time Spiral Remastered (TSR), collector number 341. Current market price: $0.79 (foil $18.36), TCGplayer market prices via Scryfall.
Trample Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.