Kaza, Roil Chaser is a rare Legendary Creature — Human Wizard card from Zendikar Rising Promos (PZNR), collector number 225p. Current market price: $0.42 (foil $1.28), 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.