Emerald and Rubys split ability to deal with opponents cards while working toward unleashing its own powerful characters makes it a deck that requires some practice to fully understand, needing some careful cardplay - and good luck - to overcome its less forgiving aspects
You also get to crash the Titanic, over and over again...flavor win
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If your Life cards are running low, it also powers up your Leader's attack
He squeaks in fright whenever a threat comes too close, and Borborygmos repays the favor by promptly turning and smashing whatever it is this tiny pipsqueak voice is yelling about in his ear
His incredibly powerful ability requires a lot of lifegain, considering you start a Commander game at 40 life, but there are a ton of ways to do it in the Abzan colors, and Bilbos static ability even helps out a little bit