12 Cards Total, one of each Legend from Set 1:

Kai’Sa: Daughter of the Void
Ahri: Nine-Tailed Fox
Volibear: Relentless Storm
Jinx: Loose Cannon
Darius: Hand of Noxus
Lee Sin: Blind Monk
Yasuo: Unforgiven
Leona: Radiant Dawn
Teemo: Swift Scout
Viktor: Herald of the Arcane
Miss Fortune: Bounty Hunter
Sett: The Boss