Kalakscion, Hunger Tyrant

Seven power on two toughness for three mana is one of the sharpest expressions of black's "who is supposed to be blocking here" school of creature design. The body is entirely offensive: two toughness means the crocodile dies to nearly any incidental ping, trades down against almost any blocker, and cannot afford to sit back on defense for even a turn. It is priced as a pure race threat, a clock that closes games fast if it connects a couple of times and does almost nothing if it stalls. There is no engine here, no death trigger, no drain; the fragility is not a cost paid for a value shell, it is the whole bargain. You buy a huge attack step and accept that the body evaporates to a single removal spell. Because it lands with no haste and no enter-the-battlefield payoff, the honest exchange for the opponent is simply killing it on their turn before it ever swings: a clean answer that costs them one card and no life. Every turn it survives untapped is pressure the opponent has to price in, but a control deck holding a cheap removal spell defuses it before the math even starts. This is the glassy legendary beater distilled to its harshest terms, a design that lives or dies on whether the deck around it can shove it through a window of attacks before something knocks it over.