You can counterspell as a reaction, so yes, but you'd be using 2 different spell slots and a reaction to cast one spell, so it's still not great.
https://rpg.stackexchange.com/questions/62217/counterspelling-a-counterspell
Worth it to revivify. Also it likely wouldn't be on the same caster as counterspell and revivify don't overlap on spell lists as far as I can think.
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You can counterspell as a reaction, so yes, but you'd be using 2 different spell slots and a reaction to cast one spell, so it's still not great.
https://rpg.stackexchange.com/questions/62217/counterspelling-a-counterspell
Worth it to revivify. Also it likely wouldn't be on the same caster as counterspell and revivify don't overlap on spell lists as far as I can think.