Right now, if a boss has an X pip value card in its hand, it just plays it regardless of the number of pips it has.
This means that it frequently plays such a card with one pip. Which wastes the spell.
In order to more closely imitate what the players do, i'm suggesting that bosses roll a "chance to cast" IF they have an X pip attack such as Judgement or Tempest.
If the chance is positive, they cast the spell
If it is negative, they pass.
if their pip count is max, they always cast the spell