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It notably introduced vampires to white after the creature type was primarily black with some red vampires from the Innistrad sets

And as noted, there's no difference between artifact card draw and card draw from other sources (like blue instants, or white enchantments, or any other source)

The Spear of Leonidas (the card Kassandra searches for) is a great Equipment as well, giving you a versatile tool depending on the game state

While the full decklist has not yet been revealed, what we have seen of 20 Ways to Win makes me fairly certain that it is going to stink

Instead, just exile another black card from your hand