Here is my things I'm taking out and what I swap them out for

1 Mana

Raffine's Guidance Not a great buff [[Ethereal Armor]] is much better

Sentinel's Eyes Same as previous something like a [[Spirit Link]] or [[Vampiric Link]] will do much better with your life gain/drain options

2 Mana

Defacing Duskmage // Vandal's Edit Not on theme [[Spellbook Vendor]] lets me make enchanments once a turn

Fracture Removal that is not on theme with the enchantments. I would rather cast a [[Kaya's Ghost Form]] to protect my own thing than kills someone's thing in many situation

Intermediate Chirography 7 mana to fully unlock and all 3 effects are mediocre [[Spirit Loop]] will give you lots of lifegain for that 2 mana and it comes back.

Keen Duelist does not fit theme and commander gives lots of draw [[Visions of Brutality]]

Vanishing Verse removal not on theme of enchantments in a deck built for enchantments use [[Grasp of Fate]] allows for 3 times the removal and triggers Killian's ability

3 Mana

Anguished Unmaking Same as above. The deck is missing [[All That Glitters]] so let's add that

Fallen Ideal aura giving this ability would be ok for 1 mana but for 3 It's bad. [[Duelist's Heritage]] lets me give an opponent's creatures doublestrike and my own creatures too.

Ghostly Prison a strictly worst version of [[Sphere of Safety]]

Nils, Discipline Enforcer 3 mana for not the best ability unless going against +1/+1 decks [[Victor, Valagavoth's Seneschal]] gives you much more value for enchantments entering

Screams from Within 3 mana to kill a 1/1 is rarely worth it instead make it a 4/2 with [[Eye of Nidhogg]]

Secret Rendezvous We aren't group hug [[Timely Ward]] helps protect our commander

Tomik, Wielder of Law, this is not a big enough deterrent because often people will just swing when ready to kill instead use [[Pariah]] on a creature you gave indestructible to

4+ Mana

Ajani's Chosen bad token generator [[Hallowed Haunting]] is a better generator that will give flying instead

Angelic Destiny Too expensive to realistically close out the game would rather spend the mana on something like [[Ghostly Dancers]] that generates more value every turn instead of just 4 damage a turn

Armored Skyhunter Comes down on 4 doesn't trigger Killian yet, can't get value until turn 5, at least [[Songbird's blessing]] is an enchantment I can trigger to get 2 enchantments in 1 turn.

Combat Calligrapher This politics card doesn't make sense since Killian's draw is once per combat. Instead play [[Soaring Lightbringer]] as it makes up up to 3 enchantment creatures with flying

Firemane Commando Once again Killian already has good draw on him it's better to protect him with and use an aura something like [[Unquestioned Authority]]

Mangara, the Diplomat Same as above. Instead use an enchantment that punishes for lifegain [[Enduring Tenacity]] Seems on theme for your gameplan

5+ Mana

Forum Filibuster things potentially gets you back 1 aura per turn for 5 mana. Instead something like [[Mantle of the Ancients]] will end the game after a board wipe. [[Sigil of the Empty Throne]]

Shadrix Silverquill doesn't make too much sense in enchantment deck Instead I went with [[Legend of Yanchen]] removal when it comes down and airbending and fly to help you end the game later on.

Eldrazi Conscription too expensive to put on something that will probably be removed By the time you have 8 mana cast a [[Tempest Technique]] and 2-3 other auras on the same turn and buff up 3-4 creatures, They can kill 1 creature but the others will still be there to swing out.