Ah yes, the action economy.
Laughs in Spell + Hasted Spell + Quickened Spell + item that give you an extra Bonus Action spell (or the BA cantrip "Shove") + Action Surged Spell + Fast Hands Bonus Action (quickened spell, obviously) + probably another item(set) that makes spells more powerful and/or gives you another action to cast a spell.
At this point you're just TRYING to find something broken, though, and if you're hardcore looking for it you're going to find it--it's impossible to fully balance a game of this magnitude. JUST having access to other spell lists isn't in and of itself broken; hell, WotC allows it, depending on choices. Ultimately we're still going to run into issues of only one conc spell, and only one spell per turn without other things stacked on top of that. I think it's fine, tbh.
