Vexing Puzzlebox

One hundred charge counters is a threshold chosen to be nearly unreachable by accident, and that ceiling is the entire joke of the design. The mana ability taps for one mana of any color and rolls a d20 each time, feeding counters back onto the box, so a single activation adds somewhere between one and twenty toward the goal. Left to its own devices, the tutor sits five, six, ten taps away: a payoff that fair play will almost never see. This is a build-around wearing the shell of a mana rock. It wants a deck stuffed with dice manipulation and roll-doublers, effects that turn each activation into a flood of counters rather than a trickle. The counter trigger keys off every roll you make, not just the box's own, so it rewards saturating the list with d20s and d6s across unrelated cards until the engine tips over at once. Clear the threshold and the reward is unconditional: any artifact from your library, onto the battlefield, no restriction on cost or type. That is what makes the absurd number worth chasing. The threshold is set high enough that reaching it feels like solving a puzzle rather than paying a cost. Skip the tutor entirely and you still have a serviceable any-color rock; engage with it and the roll count becomes the only resource that matters.