Activate Grand Architect's second ability by tapping Sphinx's Disciple, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to cast artifact spells or to activate abilities of artifacts.
Activate Mind over Matter by discarding a card, untapping Sphinx's Disciple.
Sphinx's Disciple triggers, causing you to draw a card.
Repeat.
Results
Infinite draw triggers.
Infinite rummaging.
Infinite self-discard triggers.
Near-infinite colorless mana that can only be spent to activate abilities of artifacts.
Near-infinite colorless mana that can only be spent to cast artifact spells.