Or just take them out to add in 4 more plains.  You want to cast champion of the Parish on the 1st turn, and you definitely won't do that with only 6 plains.  Nor are you likely to be able to cast your Angelic Overseer consistently, even if you had Forbidden Alchemy to dig for them.

Also, with no swamps, and nothing that looks in the graveyard, you aren't really taking full advantage of Forbidden Alchemy.  Maybe Think Twice would be better?  Or Mentor of the Meek, who is both a human and provides card advantage.  The only thing I'm unsure about is what happens when you play a creature that is nominally a 2/2 while you have something on the board that gives it +1/+1.  Does it enter the battlefield as a 2/2 (allowing you to draw a card) and immediately get buffed, or does it enter as a 3/3?

Adaptive automaton would probably work better than Lord of the Unreal.  Since you'll be giving it the human type, not only will it still count for Champion of the Parish and the Overseer, but it'll also give the other humans +1/+1.  Meanwhile, the Lord only buffs the phantasmal images.