Ashiok, Wicked Manipulator

The static ability is the real design work here, and it rewrites the price tag on a whole category of black cards. Specifically, any time you would pay life (Phyrexian mana, a fetchland's crack, a "pay N life" activation), that payment reroutes into exiling that many cards off the top of your own library instead, provided the library is deep enough to cover it. This is a redirection of a cost, not a response to generic life loss: an opponent's Lightning Bolt or a Blood Artist trigger does nothing here, because you are not choosing to pay. The loyalty abilities all feed on the exile pile that redirection builds. The +1 digs by exiling one card and keeping the other; the Nightmare tokens grow at the beginning of combat on your turn if a card hit exile that turn; and the ultimate makes a player exile cards equal to the total mana value you own in exile. Note the pile lives in exile, not the graveyard, which matters: nothing you send away is recurrable by ordinary reanimation or delve, so this is a value engine that walls off its own resources rather than fueling a graveyard shell. That closed loop is the point. It sits in the lineage of black planeswalkers that convert a resource you would normally spend outright into one the deck cares about, but the specific mechanism (life payments becoming self-exile) is unusual enough that most of its design space stays unexplored. The friction is structural: your library is finite, and every redirected payment shortens your own clock.