Spellbook Vendor is a rare Creature — Human Peasant card from Wilds of Eldraine (WOE), collector number 31. Current market price: $0.67 (foil $0.68), TCGplayer market prices via Scryfall.
Vigilance At the beginning of combat on your turn, you may pay {1}. When you do, create a Sorcerer Role token attached to target creature you control. (If you control another Role on it, put that one into the graveyard. Enchanted creature gets +1/+1 and has "Whenever this creature attacks, scry 1.")