I wonder if that line was a reference to Ursula. She had that line in Poor Unfortunate Soul song right before Ariel starts singing. Especially considering the effect that Regina used to take away their singing looked exactly like the shell magic thing.
Would have been great if she was in this episode, even if just at the wedding
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC