I always felt Icaria was underwhelming and too midrange-y for this deck. So, why not meme?
Market is experimental. I don't think you need removal maindeck and you might not need the seat. Spitefeeder is very suspect but I've liked it so far. Arcanum Hourglass is also usually in the maindeck but it's so bad in multiples and is redundant with Katra, The First Seal.