Spenta, the Magistus Sealer
Role: Premier 1-Card Starter & Extender
The deck's most important Normal Summon and the true engine-driver. Its on-summon effect to Special Summon any "Magistus" monster from the Deck (usually Zoroa) initiates your entire combo. Its GY effect also allows it to revive itself as a Tuner, enabling Synchro plays.
Missing: 36099130
Zoroa, the Magistus of Flame
Role: Primary Combo Enabler & Tuner
The heart of the combo. Zoroa's ability to equip Artemis from the Extra Deck provides a search, and its second effect provides an extra body on board for Synchro, Xyz, or Link plays.
Missing: 72498838
Rilliona, the Magistus of Verre
Role: Spell/Trap Searcher & Extender
Crucial for accessing the archetype's backrow. Her on-summon search for a "Magistus" Spell/Trap, typically Trismagistus, provides the extension needed for more complex boards.
Missing: 875572
Crowley, the Gifted Magistus
Role: Invoked Enabler & Fusion Extender
Acts as "Aleister the Invoker" on field/GY. When Special Summoned, it lets you Fusion Summon, providing seamless access to Invoked Mechaba without needing the standard Invoked engine pieces.