While Annie Joins Up is a bit narrow, only working with legendary creatures, it does have the upside of being a removal spell, which solves one of OG Panharmonicon's biggest problems, which is needing to take Turn 4 off to get it on the battlefield
The Bant deck has one of the sweetest Commanders in the set in Arixmethes, Slumbering Isle, which is a fine leader for a ramp deck, sea creature tribal, or some sort of sweet UG spellslinger deck, being a double-ramp spell on Turn 4 and eventually a finisher, killing an opponent with commander damage in just two attacks (or one, with the help of something like Berserk)
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Sleep is Paralyze, except sturdier