Did 50 games - 19 of them I lost cause of either no mana to play mummy (didn't draw pillars/pends/mana denied/pillars destroyed) or no rewind and hand clogged with useless SoRs.
Either I'm quite unlucky or this deck ain't that stable...
PS. Overall ~35% win rate vs. gold league.
No... I'm having way higher winrate in gold. I usually win 2-3 matches before I break the win streak. From my experience, it has at least 50%...
Also, this kind of decks are usually less stable, but is superb when you can pull the combo off...
It actually involves some skills for quanta management and card playing. SoRs are never useless. You can spam 2 more scarabs for one SoR, or turn your firemaster into a unstoppable monster. Use them on scarabs in case of emergency. Sometimes I devour my own scarabs to make up the hp to devour opponent creatures (e.g. dragons).
Also, everyone has a different playstyle for mummy SoR rewind decks.
As this is a fun deck to play with, a bit lower winrate doesn't matter. If you want really high winrates, try boring SNBows... although SoSe might make it a bit more fun. Remember, games are for fun.