In Magic the Gathering, the Gruul Clans were once tasked with protecting Ravnica's wild spaces. But over time, as the city grew and grew and eventually covered the entire plane, the Gruul lost their purpose. Now they're hordes of chaotic tribes, fighting between each other and razing whole districts to the ground.
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Ravnica Allegiance introduced the fittingly named Riot mechanic that represents them incredibly well: fast, aggressive, and impulsive.
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