Kaervek, the Punisher

Graveyard-recasting has been black's calling card since the earliest sets, from the honest return-to-hand of Raise Dead to the total abuse of Yawgmoth's Will, but nearly all of those effects either gate the timing or make you build the graveyard on their own terms. This warlock does something different: it launders your aggression through the crime keyword. Every crime you commit (a removal spell aimed at an opponent, a spell targeting something they control, anything the reminder text names) becomes the trigger to reach back and reuse a black card you've already spent. The interaction you were going to do anyway generates the recursion for free, so the deck this wants is one where pointing spells across the table is already the plan, and the second use rides along on top of it. What isn't free is the copy: you still pay full mana, and you still lose 2 life every time you take it. That double tax is the check on an engine that otherwise costs nothing to turn on. The copy is optional, so you never bleed against your will, but keeping the engine running means keeping up the crimes and keeping up the payments, and each cast walks your own life total toward whatever the opponent is assembling on the other side.