I would round out the broken list with Sol Ring, Library of Alexandria, Mana Vault, Mana Crypt, and Ancestral Recall
Brotherhood Regalia Brotherhood Regalia joins a select group of equipment that are beautiful on your commander
Agatha's Soul Cauldron Agent of Erebos All Hallow's Eve Angel of Finality Angel of Glory's Rise Animate Graveyard Ascend from Avernus Bag of Holding Balthor the Defiled Barishi Bazaar of Wonders Bojuka Bog Burn Away Cabal Therapy Calix, Destiny's Hand Cease // Desist Counterbore Cranial Extraction Creeping Renaissance Crook of Condemnation Crypt Incursion Day's Undoing Deadly Cover-Up Death or Glory Descend upon the Sinful Doomsday Drudge Spell Duplicity Dusk // Dawn Elixir Endurance Epic Experiment Eradicate Extirpate Free-for-All Gamekeeper Gerrard's Hourglass Pendant Gerrard, Weatherlight Hero Ghastly Conscription Go Blank Gustha's Scepter Haunting Echoes Haunting Voyage Hazel's Brewmaster Hedonist's Trove Helvault Identity Crisis Idol of Endurance Ill-Gotten Gains Into the Earthen Maw Inverter of Truth Jund Charm Kaya's Guile Knowledge Vault Lantern of the Lost Legion's End Lobotomy Mairsil, the Pretender Metallurgic Summonings Moratorium Stone Myr Welder Necrogoyf Necromancer's Covenant Nicol Bolas, the Arisen Nihil Spellbomb Orzhova Paradigm Shift Patchwork Crawler Praetor's Counsel Purgatory
It can straight up kill two things, either in combat resulting from the counter or because you randomly happen to have an enchantment like a Courser of Kruphix and you just die
Granted, 20 is a hefty investment, but with some help from massive creatures or some proliferation & co
