Yea even if its luck based for the opponent the fact we dont know when it activates is completely unfair for the game.
This skill needs nerf. Not only is it not once per duel, but it only shows that it activates on the first turn so that we know what the opponents skill. When it happens again later we have no idea thats its activated! Broken enough on the first turn making otk decks strong but even if u somehow survive u cant make a comeback because this skill might SURPRISE you! Atleast be nerfect to be only at the start of the duel or even SHOW US EVERYTIME IT ACTIVATES!!! What is wrong with konami not doing anything about what is clearly the best skill in the game now. Its been meta relevant for long enough so atleast acknowledge it now and nerf it like you did with other skills before!