Jund has been one of the most impressive archetypes in Modern MtG for many years. But for some reason, it never took off in Standard. But times have changed, and you can start playing Jund in Standard with complete confidence.
Gruul Spellbreaker and Rhythm of the Wild will instigate a series of events that will put an opponent in a rather difficult situation. Rhythm of the Wild can give all the creatures you play Haste and Gruul Spellbreaker will protect them from that pesky Settle the Wreckage AoE.
Then, in the latter stages of the match-up, you can start pushing forward such threats like Carnage Tyrant and Ghalta just to ensure another easy victory.