Yeah, Cremation decks with SoBra work well with SoFree since you can draw 4 even if you only have 4. On my alt that's lacking rares I'm running Cremations, Damsels, MP's, 3 Seraphs, 3 SoFree's, 1 SoBra, 1 upped Blitz and 4 upped Precogs. To improve it, add up to 5 SoFree's and 5-6 SoBra's.
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The best counter for Monoair SoFree decks are rainbows with Pulvy and repeatable CC like Elite Oty or Eagle's Eye as well as good healing. Some early CC helps, and Dials help a lot. Another good counter is any good SoSa deck, especially if it has Dials, but you have to be very wary of the burst damage so you don't get too low on HP. Outrushing them works, but not so much in Arena due to the 200 HP.