Before You Dive In Is this it
Its surprisingly easy to go bigger though
Let's say you control the Archangel, Raiyuu, and just three other dorks and no pumping of equipment or Auras or lands or any other combat triggers
1/Day Each: Meteor Swarm , Wall of Fire (9th level) 2/Day Each: Fireball (7th level), Lightning Bolt (7th level), Chain Lightning (7th level) 3/Day Each: Call Lightning (5th level), Melf's Minute Meteors (5th level), Agnazzars Scorcher (lightning damage) (5th level), Fire Storm (5th level) At Will: Fireball , Lightning Bolt , Chain Lightning , Thunderwave (3rd level) The Behemoth has advantage on saving throws against being charmed or stunned
Blue also offers plenty of ways to return Maelstrom Wanderer to your hand, offering not only protection from removal, but the ability to cast it again and again while avoiding commander tax