Designers used them judiciously, but when they did, they often experimented with the subtype's capabilities

Elminster | Commander | Stephen Johnson Commander (1) 1 Elminster Creatures (14) 1 Ancient Gold Dragon 1 Archaeomancer 1 Cryptic Annelid 1 Diluvian Primordial 1 Kozilek, Butcher of Truth 1 Lunarch Veteran 1 Mirror Entity 1 Oreskos Explorer 1 Sigiled Starfish 1 Solemn Simulacrum 1 Soul Warden 1 Sphinx of Uthuun 1 Ulamog, the Infinite Gyre 1 Windreader Sphinx Instants (21) 1 Aetherize 1 Aetherspouts 1 Brainstorm 1 Case the Joint 1 Chain of Vapor 1 Counterspell 1 Cyclonic Rift 1 Deliberate 1 Expose to Daylight 1 Fierce Guardianship 1 Force of Will 1 Guiding Bolt 1 Judge Unworthy 1 Overwhelming Intellect 1 Path to Exile 1 Pongify 1 Rapid Hybridization 1 Swan Song 1 Swords to Plowshares 1 Synthetic Destiny 1 Voyage's End Sorceries (13) 1 Aminatou's Augury 1 Anchor to the Aether 1 Approach of the Second Sun 1 Bond of Insight 1 Foresee 1 Interpret the Signs 1 Mass Polymorph 1 Preordain 1 Refurbish 1 Scour All Possibilities 1 Serum Visions 1 Storm Herd 1 Temporal Mastery Enchantments (6) 1 Divine Visitation 1 Intangible Virtue 1 Mystic Redaction 1 Penance 1 Retreat to Coralhelm 1 Smothering Tithe Artifacts (6) 1 Arcane Signet 1 Azorius Signet 1 Coat of Arms 1 Eldrazi Monument 1 Sol Ring 1 Thought Vessel If you wanted to tune this deck up, you could load up on fast mana, throw in some higher-powered staples like Mystic Remora and Rhystic Study and shoehorn some cEDH wincons into this list but I'm not sure it's ever going to get that close to being a real cEDH deck

Destroy those creatures
First, the deck needs to be able to build a board presence while still gaining life
Call me crazy, but I think it might actually be easier to bend time if the wizard wasnt working so hard to keep their head elevated under the weight of this insane hat
While Sigarda itself lacks hexproof, this offers great coverage that prevents key cards from being removed as long as Sigarda is still around