Kaza, Roil Chaser is a rare Legendary Creature — Human Wizard card from Zendikar Rising (ZNR), collector number 367. Current market price: $0.46 (foil $0.48), 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.