His design fits a white ETB lifegain deck that pressures opponents into awkward choices
Arahbo, Roar of the World Eminence abilities like the one on Arahbo, Roar of the World allow your commander to start providing value as early as turn 1
Then, for its fifth chapter, it gives all of your other creatures a +2/+2 boost as well as the real kicker, indestructible counters which stick around, making your entire team pretty tough to defeat
330 HP is a massive tank that wont easily get KOed, 1 Energy attacks are always great, and doing 220 damage for only 2 Energy isnt bad either
Rose Tyler, for example, has the Bad Wolf ability, which lets you put a time counter on it for each suspended card you have and each other permanent with a time counter that you control