Volo, Guide to Monsters is a rare Legendary Creature — Human Wizard card from Adventures in the Forgotten Realms (AFR), collector number 238. Current market price: $0.43 (foil $0.44), TCGplayer market prices via Scryfall.
Whenever you cast a creature spell that doesn't share a creature type with a creature you control or a creature card in your graveyard, copy that spell. (A copy of a creature spell becomes a token.)