Nameless One is a uncommon Creature — Wizard Avatar card from Onslaught (ONS), collector number 100. Current market price: $0.15 (foil $3.96), TCGplayer market prices via Scryfall.
Nameless One's power and toughness are each equal to the number of Wizards on the battlefield. Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)