Against Red sometimes even as P1 you’re playing to stabilize. In that case OS can help you stall and deny a Drakk ultimate war drums. At least that’s what I think.
I like the Rewind tech for the 4th tech. But I’m not sure how effective it is, since for example my board at the end was cheap enough that I could just replay it, whereas you’d have to float gold to play L7 Prynn + Rewind in one turn. In that sense Bigby’s Judgement Day is probably better, as well as the fact that Bigby maxes at only 5.
So, are you up for another game?