Hi, cool build here. I think since you're running on the "anti-creature" theme, here's a few cards I can suggest:

• Pendrell Mists (anti-creature)

• Glacial Chasm/Crop Rotation (combos with solemnity)

• Academy Rector (unless it's out of your budget)

• Sun Titan (recursion on most of your enchantments)

Not a fan of the following:

• Kumena's Awakening (too slow)

• Consecrated Sphinx (too out of theme and you have other draw outlets already)

• Arcane Laboratory (fits more of a stax build)

So it seems like you're trying to pull this deck in many different directions (stax, creature hate, goodstuff, pillowfort, etc.), my suggestion is to hone down on one strong theme and go with it. Hope this helps!

Thanks for your comments. Pendrell Mists seems a shoe in. Actually, I like Kumena's Awakening quite a lot. It’s a phyrexian arena for one additional mana and without the life loss. But more importantly, it can set up a protective lock with Solitary Confinement without relying on enchantresses and drawing enough enchantments.

Academy Rector will go in when I’ve sold enough other cards to buy it... might take a while

Half of my comment got deleted.

I’m considering card:Psychic Corrosion as another slow wincon. Couls work well with Rest in Peace... anyhow, thanks for your comment, it gave me good food for thought!