This is mostly for my own quick reference, but this is a list of decks I've used to farm arena, with some comments for each. I am sure some others could make good use of this, for easy shard acquisition and add a few decks of their own.
Modded PvP TADABowHover over cards for details, click for permalink
6qq 6qq 6qq 6qq 6s1 6u3 6u3 6u3 6u3 6u3 6u3 6u5 6u5 6u5 715 74f 74f 74f 77g 77g 7ah 7dm 7dq 7gm 7ju 7mu 7t9 7t9 80a 80g 8pj
? = SoSe
Bronze-Silver: I've mostly been using this for bronze, it can have some problems when trying to make the jump to silver. I've lost about 5 games out of 100 in bronze and has a nice combination of speed/reliability. SoSe is for fun, sometimes it kills you, sometimes it saves your butt, most of the time I find it to be non-beneficial.
Hard Chargin' Partiers Getting SmashedHover over cards for details, click for permalink
745 745 745 745 778 778 778 778 77a 77a 77a 77a 77a 77c 77f 77f 77i 77i 77l 77l 77l 77m 78q 78q 78q 78q 78q 78q 78q 78q 8pl
Bronze-Silver: This is a deck I made for trials, that actually turns out to be a reliable farmer for the lower leagues. I've lost about 3 or 4 games out of 50. Its a nice change of pace deck when I'm sick of using others. Quanta balance might be a little off, haven't bothered with it.
PoisonSoSaDialsHover over cards for details, click for permalink
6rt 6rt 710 710 710 710 710 710 710 710 711 711 713 718 718 718 718 718 718 71a 71a 71a 71b 71b 7q9 7q9 7q9 7q9 7q9 7q9 8pq
? = SoSa
Bronze-Silver: I haven't tried to move up past Silver with this, mostly because I don't see the point unless you need electrum. Its a bit on the slower side, but I have yet to lose with it through about 75 games. I considered adding some SoVs somehow to help counter healing decks, but seeing as I haven't lost, I don't see the need.
Modded Serendipitous JMZHover over cards for details, click for permalink
6qq 6qq 6qq 6qq 6qq 6qq 6s1 6s1 6s1 6s1 6tt 6u3 6u3 6u3 6u3 6u3 6u3 71b 745 77a 77f 7an 7dl 7gv 7k5 7n3 7q5 7q5 7t9 80b 8pj
? = SoSe
Bronze-Silver: 6 SoSe's were too much so I scaled it back to 4. Its fun, fast enough, and reliable. Haven't tried Gold, but I'd imagine it would manage well enough.
InstotosisHover over cards for details, click for permalink
6rq 6rq 6rq 6rq 6u3 6u3 6u3 6u3 6u3 6u3 74g 7ap 7n9 7q0 7q0 7q0 7q0 7q0 7q0 7q5 7q5 7q5 7q5 7q6 7q9 7q9 7q9 7q9 7q9 7q9 8pj
Gold: There was way too much denial on platinum so I scaled it back to gold.
Modded Voodoo Panic (Cloak)Hover over cards for details, click for permalink
6u3 6u3 6u3 6u3 6u3 6u3 74d 74d 77l 77l 77l 77l 77l 77l 7q5 7q9 7q9 7q9 7q9 7q9 7q9 7tg 7tg 7ti 808 808 808 80b 80b 80b 8pj
Gold-Plat: Fast enough to get through games quickly, probably not reliable enough to win spins consistently.
CCYB ModdedHover over cards for details, click for permalink
6qq 6qq 6qq 6qq 6qq 6qq 6qq 6rn 6rn 6u3 6u3 6u3 6u3 6u3 6u3 6u7 6u7 6u7 77f 77f 77i 77i 7ai 7dq 7dq 7gp 7gp 7gq 7k6 7k6 7k6 7k6 7ng 7q5 7q5 7q5 80h 80h 80i 8pj
Plat: Really just a modded CCYB. It feels like I needed something that can handle a variety of decks + handle the enormous amounts of denial in Plat. I would consider adding a purify if there is an influx of poison decks at some point. Early game can be maddening at times.
ZombieOHover over cards for details, click for permalink
74d 74d 77e 77e 77e 77e 77e 77e 7dm 7dm 7dm 7dm 7dp 7dp 7dp 7dp 7dp 7dp 7dq 7dq 7dq 7dq 7dq 7dq 7ds 7ds 7ds 7ds 80a 80a 8po
Plat: Mixed results here. Just not consistent enough for my liking. Fast when it does win though.
SPlatHover over cards for details, click for permalink
4vj 4vj 4vj 4vj 4vj 4vj 6rm 6rm 6rm 6rt 6rt 6rt 6rt 6rt 6rt 74a 74a 74a 74a 74a 7q0 7q0 7q0 7q0 7q0 7qd 7qd 7qd 7qd 7qd 8ps
Hover over cards for details, click for permalink
6rm 6rm 6rm 6rm 6rm 6rm 6rt 6rt 6rt 6rt 6rt 6rt 74a 74a 74a 74a 74a 7q0 7q0 7q0 7q0 7q0 7q0 7q0 7q0 7qd 7qd 7qd 7qd 7qd 8pl
? = SoSa
Plat: If you haven't gotten in on this gravy train, get your 6 SoV's and do so ASAP. People's decks are beginning to adjust through Bhole spam, Pests, Healing, Mindgate, Purify, etc. The Rember version is definitely the "better" of the two, but I believe Bonestorms' version performs better in the adjusted meta. This is the reason to forget about Bronze farming and move over to Plat, particularly if you have a need for electrum + shards.
Conclusion: I haven't bothered venturing too far out of Bronze because it seems inefficient for shard farming. SPlat offers an alternative to pure shard farming. Feel free to add your decks and if they look good I will try them!