Example: I FREEZE my opponent, who steals the card with DUCK. He then uses FREEZE on my char. I then PURGE my frozen char, but the effect doesn't go away. It says PURGE works on "enemy controlled cards." I would argue: 1) When the enemy uses a stolen card, he is controlling it. So, I should be able to PURGE it. Otherwise, change "controlled" to "owned", like in MTG. 2) It's counter intuitive that I cannot purge an effect he placed, even if the card was stolen from me. 3) If it is working as intended, I cannot even know if effect was in fact placed by the card he stole, or one of his own cards. Neither can he, probably. 4) If it's not working as intended, DUCK is stronger than intended.