
Each of Ravnica's 10 guilds featured three hybrid cards, one at each level of rarity as of then common, uncommon, and rare. In addition to these 10 keywords, the Ravnica block was the first block to feature hybrid mana costs and hybrid cards. The keywords introduced in the Ravnica block are: Guild

Four guilds (Boros, Dimir, Golgari, Selesnya) were introduced in City of Guilds, three more (Gruul, Izzet, Orzhov) were introduced in Guildpact, and the final three (Azorius, Rakdos, Simic) debuted in Dissension.

The Ravnica block was the first block to introduce the "guild model", wherein a number of guilds, each of which with its own cards and abilities and/or keywords, would be as introduced in an expansion and be as developed and complex as they would be (until returning to the plane with Return to Ravnica block), rather than the traditional model of expansions, wherein abilities and/or keywords would be introduced in the first of usually three expansions and then progressively increase in complexity throughout the block. Thematically, the Ravnica block was multicolor-centered and, thus, was the spiritual successor to the Invasion block of 2000–2001. Ravnica block fat packs featured specially designed life counters with artwork from the sets instead of the spindown life counters normally found in fat packs. Marketing ĭissension Life Counter featuring Rakdos the Defiler art The development codenames for Ravnica block expansions are "Control", "Alt", and "Delete".
