The Soul Stone The Soul Stone is a wonderful black utility artifact at all parts of a game
The lands we play with her should get exiled if they go back to the graveyard, but we can respond to the exile trigger, bring the lands back with some of our instant-speed recursion, and we won't have to exile them
More compelling payoffs are cards that care about tokens and/or counters
It may be limited to a single extra card per turn, but it wont be long before they have paid for themselves many times over
You can play a Rakdos deck where you hold removal, and you fire the adventure and follow with the dragon if opponents dont play anything
At the beginning of your end step, create a tapped 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent." Then if you control four or more Wizards, transform Kuja