Like Gruul, Boros is a guild that is forced into the attack role in order to reap the benefits of its guild mechanic.

FORBES: Gatecrash: Evaluating Boros

Dimir is much more subtle than Boros, Gruul, or Simic, but stabilization and multiple connects with an encoded spell can usher in disaster.

FORBES: Gatecrash: Evaluating Dimir