I haven't unlocked anything you mentioned except the Arcanist, yet - I'm excited to try this combo out, and add their abilities to The List™. My current mainstay is MC Druid (or whatever the Nature class is called, I don't remember if it's named properly), with Roxy, Anna, and Phoenix. Nature's Fortress just keeps building those dice, and all three die types are covered for heavy damage. d4 bonuses? Spam Anna's Fire Bolt. d8? Nature's Wrath, bby. d12? Let Phoenix go nuts. Choose Mana capacity/regen increases whenever possible, and watch the enemies fall to beeg numbers.