Milva was just ST's Madoc, more non-interactive but required deathblow. Saskia on the other hand is a "win a round" card, doesn't matter blue or red coin. Saskia just wins a round, possibly on even on red coin, thinning a deck at the same time. And you can't do shit about it unless you're playing teched SK deck or NG with Treason (Blightmakers, Raffard's or Miruna are RNG, traps lost their Serpent Trap answer if Saskia pulls sentry). That was the problem, not Milva. People hated Milva because of removal value this card provided but giving it deathblow 1 makes this card awful, sometimes even useless because leader charges are tied to it and ST doesn't have NR's engines helping setting up deathblow. I'd rather change Milva's provisions to 12 (if needed) but this patch's change is terrible.
Also alumni are coming back as strong as before because of lazy balancing and making their worst matchup awkward to play.
Source: https://www.reddit.com/r/gwent/comments/s5apx0/how_was_milva_nerfed_but_not_saskia/