MArcomage

Replace your hand, except the played card, with cards from enemy deck.

I think that it is not needed to have the "except the played card" condition, since if this card is replaced, it will directly be replaced by the durable keyword with the "Madness persists" card.

You can shorten the text of this card by removing this line, of course only if i'm right with my argument.

I would just say "Replace the rest of your hand with cards from enemy deck."

Yeah, I thought about that. In case if durable does not override I'll go with DPsycho's suggestion.

Keywords occur after card effect, so it should function as desired.

You might still want to sayrest of hand in order to avoid confusion. Especially with newer players.

Technical problems aside, I would make this card zero cost, uncommon and non durable.
oh well, that would be a totally different card.

The reason to keep it Rare is that you're fishing for your opponent's better cards with a very good rate of drawing Rares. Use the one or two good ones you draw, then redraw a new set of seven cards.