At a cost of only four ink, it's easy to get Madam Mim onto the board fairly early in the game
Powerful but likely overrated
If you hover over the logo, it will tell you how many of each wildcard you need to finish the deck
Heres how that list shakes out: Cubwarden $2.99 Dirge Bat $3.99 Everquill Phoenix $5.99 Gemrazer $5.99 Sea-Dasher Octopus $11.99 Brokkos, Apex of Forever $12.99 Illuna, Apex of Wishes $19.99 Nethroi, Apex of Death $19.99 Vadrok, Apex of Thunder $19.99 Snapdax, Apex of the Hunt $22.99 Indatha Triome $24.99 Ketria Triome $24.99 Raugrin Triome $24.99 Savai Triome $24.99 Zagoth Triome $24.99 My assumption is that Cubwarden and Dirge Bat will eventually end up in the $1-$2 range, but Everquill Phoenix and Gemrazer still have a shot at seeing competitive play
Being in Izzet colors makes it already more color restrictive, so unless youre playing exactly UR Murktide, youre looking at least into a 3 color shell to make Expressive Iteration work