You can use mutate creatures, such as Gemrazer and Sawtusk Demolisher as enchantments on Sarulf, and maybe something big enough you probably wont be exiling such as Ghalta, Primal Hunger since your commander himself should make dirt cheap to cast, but beyond that I find a combination of ramp, removal, and protection for Sarulf will suit you best
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When a deck runs over thirty mana sources it doesn't want to be forced into playing three-drops that are creatures but it also wants three-drops that will help it attack
Fain, the Broker is an okay aristocrat commander, but it provides its best value by making Treasure tokens
Having a lower powered deck in your arsenal lets you play at more tables and not inadvertently pubstomp a more casual pod because you simply didn't have anything weak enough to make for a fun game
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