It can target any player, so its not strictly worse than any other card, but it just seems like a bad portent, when you cant just have Card not found
The fact that you are helping your opponent so much is not much of a threat if you run Imposter Oaks Revenge in there to counter all that drawing for them
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The only downside I see is that it deals damage based on its power rather than its toughness, but in return, you get to draw many cards based on the latter
(There was a time when there was no maximum limit, which swiftly changed after someone entered a German tournament with a 2000+ card deck.) A tournament deck will always be 40 cards because the fewer cards you have, the more likely you are to draw the ones you want