"Triple" Gestalt

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You wouldn't have enough actions to use it. at low levels you would never run out of slots but at higher levels you get that anyway. Without something to break the action economy massively it won't be much more powerful

I think there are a few feats that let you spend spells to fuel certain abilities, can't remember off the top of my head.

Fey Druid 3/Bard 2/Arcane Hierophant 10/Mystic Theurge 5//Sorcerer 4/Bard 16//Wilder 20

Be the master of Charisma.

Yo dawg I put some Bard in yo Bard so you can sing while you sing.

Sup dawg, I heard you like bears so we put a bear in your bear so you can maul while you maul.