I am using Errant and Giada as a Brawl commander and whenever I attack and defeat a battle I am given the option to cast Errant and Giada instead of the flipside of the battle. When I decline this and cast the flipside of the battle Errant and Giada disappear from the game and I can no longer cast them. This has happened twice now for different battles (Invasion of New Phyrexia and Invasion of Dominaria)
I am using Errant and Giada as a Brawl commander and whenever I attack and defeat a battle I am given the option to cast Errant and Giada instead of the flipside of the battle. When I decline this and cast the flipside of the battle Errant and Giada disappear from the game and I can no longer cast them. This has happened twice now for different battles (Invasion of New Phyrexia and Invasion of Dominaria)