Kaza, Roil Chaser is a rare Legendary Creature — Human Wizard card from Outlaws of Thunder Junction Commander (OTC), collector number 232. Current market price: $0.23, TCGplayer market prices via Scryfall.
Flying, haste {T}: The next instant or sorcery spell you cast this turn costs {X} less to cast, where X is the number of Wizards you control as this ability resolves.