The countdown text “x more” or “ready” on Yogg-Saron, Master of Fate counts spells countered by counterspell but the effect does not trigger if less than 10 spells actually cast.
Reproduction:
cast 9 spells,
have your opponent cast counterspell,
cast one more spell.
Result:
Yogg-Saron, Master of Fate card says “ready” but when cast no battlecry effect happens.
Expected result:
Either card text does not update on countered spells or battlecry effect happens if 10 spells were cast, including countered spells