Mutant Surveyor

Black rarely gets a graveyard card-draw engine that costs nothing to set up, and this one hides the payout behind a condition most decks in the color are already trying to meet. The exile-draw ability wants your speed at 4, the maximum, and speed only rises on turns where you have already dinged your opponent for a point or more. So the creature effectively interviews the deck around it: if you are the one pressing the beatdown, a spent 2/3 exiles itself for three mana to refill your hand, no attack required and no graveyard reuse involved (the draw pulls fresh cards off the library, not back from the yard). If you stall out, you are left with a modest attacker and a repeatable pump. That pump is the glue while you accelerate: it lets the body trade up in combat or squeak through a point of damage, and that same damage is what nudges you toward the threshold that turns the draw on. Every piece pulls in one direction, offense feeding the counter, the counter unlocking card advantage, the card advantage funding more mana spent on pressure. It is a payoff engineered to punish the durdle: climb to top speed and a dead creature becomes a fresh card, but sit back and it never pays out at all.