Spectromancer is an expandable card game that is published exclusively as a videogame. The expansion cards are sold as fixed sets and there is no collecting, trading, or deck building in Spectromancer. The game was created by Richard Garfield, Alexy Stankevich, and Skaff Elias. Spectromancer is a refined version of Stankevich's Astral Masters.
The game plays as follows. It is a duel between two wizards who battle with spells and summoned creatures on a battleline of six slots. Each wizard has 60 hit points and games typically ends when one wizard is reduced to 0 hit points. There are five kinds of element cards and currency: Fire, Water, Air, Earth, and special elements. The special elements depends on the wizard's specialization. For instance Mechanician wizards specialize in summoning mechanical constructs for attack while Cleric wizards specialize in defensive healing spells. Every duel, each wizard gets five random cards from each element. To play a card you must pay the appropriate game currency, the elemental power points. Thus Fire card requires Fire points to play. Every turn, you gain one points across all elements, and managing the game currency and hit points are core to gameplay.
Spectromancer fixes a problem of Magic: The Gathering. In Magic, deck building is a cerebrally challenging project that often involves spread sheets and intricate balancing. However, during play, the correct move given available cards can be obvious. As Garfield said in an interview, "...it's exciting but in Magic often the cards play you...." In Spectromancer, you get a hand of cards, and it is up to you to set up combos and use superior resource management skills. As for deck building, Garfield says: "There are many benefits to having no deck construction, which may not be immediately apparent. You don't have to worry about running into the same degenerate deck again and again. You don't have to refrain playing with the 'fun' cards because they don't win. You have to learn to use the tools you are given rather than use the same tools again and again."
The Flash version of Spectromancer has most of the features of the full-featured client-server version, including a campaign mode where you fight wizards to get new cards, Pokemon-style.