Selesnya Cluestone

The guild-mana-rock-that-cantrips template solves the oldest problem with fixing artifacts: the dead late-game draw. Early ramp wants no strings (tap, get a color, repeat), but a rock that does only that becomes a blank the moment your manabase is set. This one front-loads the fixing and back-loads a payoff, so the artifact that smoothed your opening converts into a card later, when the mana itself has stopped mattering. The discipline is in the draw cost: , the tap, and the sacrifice, all paid in the guild's own colors. You cannot cash it in casually; you have to be flush enough in both halves of the pair to spare the activation, which keeps the artifact a fixer until the game has reached the point where trading it for a card makes sense. That sequencing (a color when you need mana, a card when you do not) explains why the cycle exists, and it is a cleaner answer than the inert rocks of earlier eras that just sat in hand once the game opened up. It is a humble engine, but the structure is sound: cast for , it never becomes a dead draw, and the only thing it asks on the turn it enters is to start producing one of the two colors you were already building toward.