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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

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

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

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

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