All ten guild mechanics, originally introduced in the Return to Ravnica and Gatecrash sets, return in the Dragon's Maze set. For more information on those mechanics, please see the Return to Ravnica and Gatecrash FAQs at Wizards.com/Magic/Rules.

Return to Ravnica: detain (Azorius), overload (Izzet), unleash (Rakdos), scavenge (Golgari), and populate (Selesnya)
Gatecrash: extort (Orzhov), cipher (Dimir), bloodrush (Gruul), battalion (Boros), and evolve (Simic)