Whiptail Moloch

Here is a body bolted to a self-destruct switch: six power for a modest red cost, and an enter trigger that fires three damage into a creature you control whether you have a good place to put it or not. The numbers tell the whole story. Toughness three, damage three. Cast it onto an empty board and the only legal target is itself, and three is exactly enough to bury it the moment it arrives. So the card is not a beater you splash in; it is a payload that demands a landing pad. The deck has to supply a creature happy to eat three: something with toughness to spare, a regenerator, an indestructible body, or, best of all, a creature whose own ability turns damage into upside (persist and undying shells convert the wound into a trigger, and damage-counter or "whenever this is dealt damage" engines treat the trigger as fuel). Pay that tax with the right target and you have spent four-and-red on a real clock plus a free three-point ping you wanted anyway. Fail to, and you have spent it on a Lizard that kills your own dork or kills itself. The drawback has no off switch and no flexibility: it is mandatory, it must target your side, and the body's own toughness makes the empty-board case lethal to the card itself. That rigidity is the puzzle, and it is why the printed stat line reads better than the card plays anywhere it is not built around.