Ghoulcaller's Bell

Symmetry is the whole tension here: every activation mills each player, controller included, one card per tap. That makes it a self-milling enabler more than a way to attack an opponent's library, and which side it actually serves depends entirely on who is building around the graveyard. In a deck stuffed with flashback spells, recursion threats, or delirium-style payoffs, feeding your own yard a card a turn is the point; against an opponent with no graveyard plan, the same activation merely thins their deck while doing nothing for your board. The clock it sets toward decking anyone is so slow as to be irrelevant: one card per turn is dozens upon dozens of taps from emptying a library, and that was never the job. The card lives or dies on graveyard synergy, not on the mill count. Slow, repeatable, untargeted yard-filling for one mana is what it offers, and the symmetry is the price tag attached. Since the only cost is the tap, it stays online indefinitely at no ongoing investment, but the effect is small enough that it rewards engines built to convert cards-in-graveyards into resources rather than any plan to grind a library to zero. It belongs to the family of cheap artifacts that turn the mill keyword inward, treating your own deck as the resource to be spent.