Hum of the Radix

A set built end to end around artifacts, then a green enchantment whose whole job is to make that marquee card type unaffordable. The tax scales with the offender's own board: the more artifacts a player has committed, the steeper every subsequent artifact spell becomes, which means it bites hardest against exactly the decks leaning on artifact density. That self-reinforcing curve is the wrinkle. A flat cost-bumper like Sphere of Resistance adds the same fixed penalty no matter what; this one compounds with each artifact already in play. Against a deck running two artifacts it barely registers; against an artifact-saturated engine it can stack the next spell six or seven extra, often stranding a hand outright. The placement is the deliberate part: green has the least native business asking artifacts to cost more, so this reads as a hoser slotted into the color identity assigned the role of artifact skeptic. Note that the text is symmetric even when the effect is not. It taxes its own controller's artifact spells too, which keeps it honest in mirrors and makes it a poor fit for any deck that wants artifacts of its own. What it represents is a format hedging against itself, an early-era hoser whose entire purpose is to punish the thing its home environment was built to celebrate.