5 Rhystic Study And Smothering Tithe Enchantments that are synonymous with Blue and White decks respectively in Commander, Rhystic Study and Smothering Tithe each provide their controllers with value based on their opponents' actions if a mana tax is unpaid
If the creature it's attached to becomes an illegal permanent for it to enchant, the Aura Equipment will be put into its owner's graveyard as a state-based action
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Commander (1) 1 Valgavoth, Harrower of Souls Creatures (32) 1 Barbflare Gremlin 1 Blood Artist 1 Blood Seeker 1 Braids, Arisen Nightmare 1 Brash Taunter 1 Falkenrath Noble 1 Fate Unraveler 1 Florian, Voldaren Scion 1 Gleeful Arsonist 1 Gray Merchant of Asphodel 1 Harsh Mentor 1 Kederekt Parasite 1 Mogis, God of Slaughter 1 Morbid Opportunist 1 Nightshade Harvester 1 Persistent Constrictor 1 Rampaging Ferocidon 1 Solemn Simulacrum 1 Stormfist Crusader 1 Vial Smasher the Fierce Artifacts (11) 1 Arcane Signet 1 Basilisk Collar 1 Fellwar Stone 1 Lightning Greaves 1 Mind Stone 1 Rakdos Signet 1 Sol Ring 1 Sance Board 1 Talisman of Indulgence 1 Thought Vessel Enchantments (5) 1 Bastion of Remembrance 1 Enchanter's Bane 1 Spiked Corridor // Torture Pit Instants (6) 1 Blood Pact 1 Chaos Warp 1 Infernal Grasp 1 Rakdos Charm 1 Suspended Sentence Sorceries (7) 1 Blasphemous Act 1 Feed the Swarm 1 Grab the Prize 1 Light Up the Stage 1 Sadistic Shell Game 1 Sign in Blood Lands (24) 1 Temple of the False God

This presents a whole new problem in the entire pacing of your deck if theres any impedance at all
This applies whether they go the graveyard, are returned to hand, exiled or removed in any other way