In my example, Y'shtola, Night's Blessed is a great commander to maximize my use of Toxic Deluge, so in the Deck Filters area, I started typing the card name, it popped up so I selected the card and clicked the + button to the right and now the green box below it tells me the decks I view will include Toxic Deluge
Overall, Korvold's deck is fairly powerful, but it lacks the complex nuance of other top-tier commander decks and can feel a bit repetitive
A Master of Etherium might be okay to trim as it can be outsized or Reflector Maged, keeping to the hidden four three-drops against fast decks rule. Blood Moon and Ghirapur Aether Grid are too slow to do anything
But they wont last as long as a good Ultimate Guard, Dragon Shield, or other brands
Mark Rosewater has explained that they exist to balance the metagame and to encourage players to play multicolor decks
Grixis flashback has a strong contender here for best Commander for the archetype