Here are two decks which should grind Gold and are also based upon Shard of Freedom:
Spoiler for Hidden:
Chaos Wyrms
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6u2 6u2 6u2 6u2 6u2 6u2 7ms 7ms 7ms 7ms 7ms 7ms 7mt 7mt 7mt 7mt 7mt 7mt 7mu 7mu 7mu 7mu 7mu 7mu 7nq 7nq 7nq 7nq 7nq 7nq 8pj
SoB Air Rush
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7ee 7ee 7ee 7ee 7ee 7ee 7ms 7ms 7ms 7ms 7ms 7ms 7mt 7mt 7mt 7mt 7mt 7mt 7mu 7mu 7mu 7mu 7mu 7mu 7nq 7nq 7nq 7nq 7nq 7nq 8po
If you want something else to grind Gold with that doesn't involve SoFree Monoairs (which may or may not contain splashes), you can look here for other decks to use.
Thanks for highlighting those decks. I decided to adopt the SoB air rush. :-) It's truly fast!
I need one more SoFre but it's working perfectly also with 5.
P.S.: In case someone wants to know, it totally doesn't work in Platinum, but it has a very good win rate in Gold.