When discovering the cards you have to think about wether you want the most useful minion or pick the one with the best card text. The card texts Rafaam gains count as buffs so he doesn't keep them if you return him to your hand or deck. Because of this, discovering battlecry minions will not have any effect on Rafaam (but you still gain the battlecry minion ofcourse).
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You can get an Emeryss and Duskbreaker :D
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Thanks for the feedback, I updated the card image and I found your feedback very useful