So this deck is a combo deck using Spirit Mirror to destroy any creature I want for just 1 colorless mana when I have Unnatural Selection or any of the other creature type changing cards. I can also use Undead Slayer and the ever expensive King Suleiman to kill creatures if I don't have the mirror. I can give Dragon Hunter and Elite Inquisitor protection from creatures with Unnatural Selection as well. And for grins and giggles I will be sure to play up IRL the inquisition aspect when I change the opponent's creatures' types. "You're a vampire I just know it!"
The main thing that the deck needs is dig/draw. Mystic Remora, Ponder, Preordain, Impulse, Trade Secrets anything that will help you find your combo pieces and cast them on curve. Your deck consists of far too many situational spells/effects to omit them.
1x Mirror-Sigil Sergeant
4x Amoeboid Changeling
4x Dragon Hunter
4x Elite Inquisitor
1x King Suleiman
4x Undead Slayer
7x Island
13x Plains
4x Tranquil Cove
Sorcery (4)
4x Mass Appeal
Instant (8)
2x Crib Swap
4x Shields of Velis Vel
2x Negate
4x Spirit Mirror
4x Unnatural Selection
Some semi-random suggestions.
(-:
My meta: 3 or 4 player free for all, anything goes but boring games or broken decks cause a vote to end that game.
Spicy one-offs hitting the theme could be "You are not real!", "We ride together, we die together" and "No one expects the Spanish Inquisition!".
Vedalken Æthermage can fetch you Amoeboid Changeling, Crib Swap and Shields of Velis Vel or work as a surprise bounce.
Guilds of Ravnica - Commander 2018 - Core 2019 - Battlebond - Dominaria - Rivals of Ixalan - Ixalan - Commander 2017 - Hour of Devastation - Amonket - Aether Revolt - Commander 2016 - Kaladesh - Conspiracy 2 - Eldritch Moon - Shadows Over Innistrad - Oath of the Gatewatch - Commander 2015 - Battle for Zendikar - Magic Origins - Dragons of Tarkir
Green - Blue - Red - White - Gold