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Keeping a counter spell up for your opponent's commander means you've not only disrupted their plans, but you can either cast something else for free or add a card to your hand

On the extreme end, theres Enter the Infinite, but with a Reliquary Tower and some draw spells, in creature form like Arcanis the Omnipotent or the classic way with Mystic Confluence or Jaces Ingenuity, you wont need to be full-throttle

That's yours for stuff like heroic or your foe's for interaction

This type of effect is most powerful in mono-black, where you'll have a lot of Swamps to play with, but can also be very effective in simple dual-colored decks

Copy Artifact can double as a Black Vise to help kill the opponent faster, or can simply copy the opponents best artifact in play, like Jayemdae Tome