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A Toxic Deluge board wipe on turn 3 for the Cabal Coffers deck seems perfect for hitting The One Ring on turn 4

You also draw a card if you control six or more humans, providing you with the card advantage that typal decks often need

The reason I included these creatures instead of all infect creatures is because I like the variety, and some of the creatures with toxic have additional abilities that really help the deck shine

Since Cap is a relatively early commander to deploy, you want cheap equipment that can be attached to it right away like Colossus Hammer, Lavaspur Boots/Lightning Greaves/Swiftfoot Boots to give it haste and protection, and other cheap ones that can be played on curve and give the boost this commander needs to overperform in combat

Either you are behind enough when you can play it that giving them a free thing, even it is just a 3 or 4 drop, might be too much to recover from

If youre newer to Magic, Tatyova, Benthic Druid can be a good first lands-matter commander