Silence Is Golden

Looks like Mournful Deathcap won't be getting you again. My main comment is just to tighten it - make it a 75 card deck, decide which 1 ofs can be cut and which you should change to 4 ofs, add more seats/crests (you don't need 21 basic sigils - at most you need 9-10). I might suggest 4 cobalt waystones since a face aegis can stop Solitude, a common win-con of mill decks. Kosul Diplomat isn't that strong of a card, whereas Valkyrie Enforcer is great and should be 4 of. Rebuke is a little weak - just because it leaves a unit behind, but naturally if your goal is to be the bane of Deathcap's existence I get it. But in most match-ups, it is a weaker card. Shield bash is weaker than the weapon that can spellcraft it. Aniyah is a great card, especially if you have ways to activate renown. Crown of possibilities is a lot weaker of a card without draw spells - maybe cut it or add in draw spells. If you want this to be a honed deck, decide what your own win-con is, not just which deck you're trying to beat. Sword of Unity is a great win-con, so is xenan obelisk if you consistently find that you have wide board. Instead of infinite hourglass, if you have the latest campaign I would consider Korovyat Palace. Nesting Avisaur is okay with Crown, but not necessarily strong with the rest of your deck. Anyway, just some thoughts. Have fun and keep brewing!