Boulder Jockey

The symbol turns your land drop into a resource you can spend, and this Goblin is the clearest demonstration of what that costs you. Attacking is cheap; the payoff is not. Every Boulder you make is a turn you skip playing a land, so the card asks a question no other aggressive creature phrases quite this way: is a 3/3 that arrives already tapped and attacking, then dies at the next end step, worth a full development step? Because the token enters mid-combat, it sidesteps summoning sickness entirely and drops three extra power into a swing where it would otherwise have needed a turn to matter, but the sacrifice clause and the land-drop tax keep it from snowballing into anything permanent. It is a burst of pressure rented against your own mana curve. The design is honest about the tradeoff: pay the on a turn you were going to sit on lands anyway, or on the turn you want to close, and the math tilts your way; try it every combat and you strangle your own board development. That tension is the whole mechanic in miniature, an economy where your growth and your immediate reach draw from the same well, and this card makes you pick one every time it attacks.