Feed the Serpent

Black doesn't get to exile things without paying for it, and this is the invoice. Removal in black has always come with strings: a creature comes back from the graveyard, a spell only hits nonblack, a Doom Blade blanks against the wrong color, a Hero's Downfall answers the threat but leaves it in the yard to be reanimated. Unconditional exile at instant speed, hitting both creatures and planeswalkers, is white-and-blue territory: it's what Vindicate and its descendants offer, and black historically has to trade something extra to reach it. The tax here is the double-black cost at four mana, which is steep enough to keep this out of the tempo-oriented removal slot that a Fatal Push or a Cast Down fills. What you buy for the premium is finality with no exceptions clause: it goes past indestructible, past regeneration, past death triggers, past any graveyard recursion the target hoped to leverage. That makes it the answer black reaches for when the target isn't the body but what the body threatens to do after it dies, and when nothing cheaper will actually make the problem stay solved.