Shadowfeed

Graveyard hate that pays you back. Most one-mana exile-a-card answers ask you to spend a slot on disruption you may never need, dead weight against decks that do not lean on the yard. Bolting three life onto the back of the exile changes the math: even when there is nothing worth exiling, you are buying a turn against aggro, and when there is, you get the answer plus a buffer. The trade is reach. This hits exactly one card, so it is a scalpel against a key flashback or reanimation target rather than a broom for an entire graveyard the way Bojuka Bog or Tormod's Crypt operate. That single-target restriction is what lets it cost a single mana and still hand you a meaningful life swing: a wider effect at this rate would be oppressive. The instant timing carries the rest. A reanimation spell that targets a creature in a graveyard is sitting on the stack with that target locked in; respond by exiling the card it is pointing at, and the spell fizzles for lack of a legal target. You can also hold it through an opponent's draw step and snipe the linchpin only once they have committed to needing it. It is a modest piece of design from an era when graveyard interaction was starting to get folded into cards that did a second small job, so the slot was never wasted.