Negated sentences confuse me, here are my suggestions:
Temperance: "Cannot attack enemies of lesser value than itself" => "Can only attack enemies with value greater or equal to itself"
Chastity: "Cannot attack enemy units on the opponent side of the field" => "Can only attack enemy units on your side of the field"
Patience: "Cannot attack enemy units before move x" => "Can only attack enemy units after move x-1"

Temperance is the most confusing of these 3