Probably Hawkmoon. PSN exclusive, so Xur won't sell it and if you are on xbox, you can't even get it. Though the 4th Horseman might be rarer, only because there are probably people that will dismantle the Horseman because it is terrible, but most people probably wouldn't dismantle the Hawkmoon.
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Liar hawkmoon easy. Throw money at screen and poke Sony. You liar. Hawk not on list.