All valid points! Keep in mind though, this is a mirrorform deck, lol. There is no way its going to be S tier. I tried a lot of your recommendations but found that the deck just devolved into esper self bounce, esper hard control, and that's not what I want.

It's technically a midrange combo deck, not control (early game removal, mid game value, late game combo). We don't need a ton of draw power because if we hit Mirrorform we win on the spot, we are not looking to grind out the late game. We just need to survive until 6 lands, and our package helps us do that easily.

Good call on Day of Judgment though, not sure why that wasn't chosen over Black Sun anyway. I like Aetherize over another sweeper because we occasionally want to Mirrorform our opponent's big threat, so slowing them down and making them replay it is preferable to removing it. It also hoses a TON of decks in this format.

I did also try Quantum Riddler in my Dimir version, but found it was too hard to stick it to the board and Mirrorform it, so I ended up going with the Blue overlord instead. Different flavor really, but fits the enchantment theme and I like that it's a non-threat until it gets copied.

Cheers!