Magic: The Gathering – Duel Decks: Heroes vs. Monsters (2013)

Description from the publisher:

Legendary monsters have always threatened the civilizations of the Multiverse—and inspired glory-seeking heroes, eager to stop them. Which will prevail?

Duel Decks: Heroes vs. Monsters introduces six cards from the Greek-myth-based Theros set, new Theros-based art, and two new game mechanics: heroic and monstrosity.