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Get 1 Rare or Mythic Rare, 3 Uncommons, 10 Commons, and 1 Snow Land (basic or tapped dual) in every pack

Ive already covered Dockside, but for a quick overview of the various ways to generate infinite mana, see above

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

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

You choose both targets if you cast the spell

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