Yes, please enter a script for the fix. Logic such that IF character has "Saint" or above AND non-magic using AND "magic attack" bonus granted (or over X) THEN reduce magic-attack by that number and add the item ("Card") to the player inventory. Perhaps even an auto-generated email "You're sanctification attempt has been reversed," or some sort of notification.
To say "Oh that can't be un-done and it's just a game of chance" is simply taking the easy way out. Please rise to your potential and provide the exceptional support and development expertise we've seen demonstrated in the game. The effort we've seen is worthy of praise, please keep it as such.
KA