Blitzball

A three-mana rock that taps for any color is a modest thing on its own; the flavor keyword bolted underneath is where the design gets loud. GOOOOAAAALLL! turns a generic fixing artifact into a one-shot payoff, but only if a legendary creature connected with an opponent this turn, which welds the ramp to a legend-centric attack plan rather than to any board state you can assemble in isolation. That condition does the real work: the artifact sits inert as fixing until the turn your legendary swing goes through, then cashes itself for two cards as a reward for the aggression. The sacrifice sits at the center of the deal. You get one burst of card advantage, not a repeatable draw, so the same permanent lives two lives in sequence rather than at once: mana source first, then a self-destructing draw spell the moment combat cooperates. It is a design that reads as a joke (the keyword is literally a soccer chant) and functions as a genuinely pointed piece of build-around tension. The games where it does nothing are the games your legends stayed home; the games it draws two are the games you were already winning the combat math. The card asks not whether you have a legendary creature, but whether it is attacking, which is a narrower and more aggressive question than most fixing ever poses.