or a Double Rainbow Foil Serialized Elven, Dwarven, or Human "Sol Ring" card
In typal decks, you nullify your opponents spot removal, which is good to protect your main lords
Whats more, there are some pretty common threads in terms of colour identity
Abilities like scry or surveil count as card selection because they let you manipulate your library to improve your future draws
This fundamentally changes the control matchup
Peacocks text box suggests two deckbuilding avenues: first, artifacts that youd want to sacrifice for a benefit (other than the Clue draw a card ability), and second, you want creatures that give you a benefit by being unblockable (other than just smashing life totals)