Quoting thegamer, the cards are are selected based on their gameplay and story value, and in particular how each character relates to the overall narrative of the set
I was certainly tempted to add Senseis Divining Top to emulate Yawgmoths Bargain, but I think thats going a bit too far into combo land for my tastes, though I have no doubt Bolas would have zero qualms about it
Sure, I'm cheating, but I didn't want to have an objectively bad deck that never got its commander into play
Heres a step-by-step guide on how to successfully mutate one card onto another on MTG Arena: Step #1
The plane also holds its own secret

Aerial Extortionist Angelic Gift Angelic Sell-Sword Armed with Proof Case of the Pilfered Proof Cast Out Chosen by Heliod Curse of Silence Dawn of a New Age Detention Chariot Eagle of Deliverance Elspeth Conquers Death Errand-Rider of Gondor Farsight Adept Form of the Approach of the Second Sun Four Knocks Glimmer Lens Inspiring Commander Inspiring Overseer Invasion of Dominaria Loran of the Third Path Mentor of the Meek Nick Fury, Spymaster Novice Inspector Orator of Ojutai Origin of the Avengers Ox Drover Pentarch Ward Potion of Healing Priest of Ancient Lore Primary Research Professor of Symbology Puresteel Paladin Raffine's Informant Resistance Squad Roving Harper Rumor Gatherer Rune of Sustenance Sage's Reverie Sanctuary Warden Search Party Captain Serene Sleuth Settlement Blacksmith Sigarda's Splendor Slayer's Bounty Spark Rupture Sparring Regimen Spirited Companion Splinter, Aging Champion Stack of Paperwork (playtest) Staff of the Storyteller Stalwarts of Osgiliath Tale of Tinviel Teyo, Geometric Tactician The Night of the Doctor The Princess Takes Flight The Restoration of Eiganjo Thraben Inspector Trial of a Time Lord Unquestioned Authority Vault 101: Birthday Party Wall of Omens Wedding Ring Woodland Acolyte
