Kismet's advanced rule wrote:
At the start of the villain turn, Kismet deals each hero affected by a jinx card 2 psychic damage.
If a single hero is affected by two jinx cards, does this cause two instances of psychic damage? "A" is very often used in place of "per" (as in "60 miles an hour" or "one a day") which would suggest so. If not, clearer wording could've been "each hero affected by any number of jinx cards" ... but clear wording is not this game's strength.