SoPa buff combined with Puri buff over-nerfed SoSa. I have used SoSac decks something like three times this season. In over 85 matches of 2-3 games each. Purify or SoPa is an instakill, a hard-counter to SoSa. Playing SoSa brings you into an incredibly vulnerable hp range, where if the opponent has SoPa or Purify you are dead. SoFoBow is an incredibly common deck that packs SoPa and sometimes Purify. Any other deck can pack SoPa at a minimal cost. Why the heck would you want to nerf a dead card?
Oh, and to reply to some of the main points of the original topic:
-SoSac is one of the least splashable of all the shards.
-Purify is situational, yes. But it is also so very easily splashable in anything with water or a bow. From SoFoBow to nova-catatitans to speed poison to SoP Squids, Purify absolutely destroys SoSac and Poison and is going to be used in any deck where it can fit.
-Please don't mention Arena in your nerf topic. Please. Think of the baby dolphins, crying over talk of PvE in a game where balance is based on PvP. Crying baby dolphins.
-SoSa stacking is not a problem. Hand emptying is not a problem. It gives you greater quanta leeway in return for greater risk of a sudden counter, and it also takes away the possibility of staggering SoSa (example: T1SoSa, heal, T2 SoSa continues, heal, T3 take damage, T4 SoSa, repeat). The only possible instances where hand control is an issue would be Electrum Hourglass/Golden Nymph drawing, Fractal or Nightmare. Using SoSa with any of the first three goes against all laws of nature and usefulness, and buffs Nightmare as a healing tool while nerfing it as a damaging tool (could otherwise nightmare during the 'stagger' turn). I, however, highly doubt that you cared about SoSa stacking because of how it nerfed Nightmare damage.
EDIT: Also, please give us a Do Not Nerf option.