Golden Persistent Poet (Divine Shield. Adjacent minions permanently double and keep your enchantments from combat.) is not doubling combat enhancements on Motley Phalanx when paired with Sky Pirate Flagbearer (Start of Combat: Give your other Pirates “Deathrattle: Summon a 1/1 Pirate. It attacks immediately.”)
Motley Phalanx will not double deathrattles recieved during combat.