Gatecrash continues the Return to Ravnica block, focusing this time on the remaining five Guilds of the city plane. Like Return to Ravnica, the preceding expansion set, Gatecrash focuses on the guild system and multicolor cards. The five guilds returning in Gatecrash are the Boros Legion, House Dimir, Gruul Clans, Orzhov Syndicate, and Simic Combine.