They come in and immediately ask you to go grab a basic tapped and gain a life
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
Its surprisingly easy to go bigger though
That means you can dodge removal, react to attacks, and just generally mess around and surprise your opponents however you wish
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