Blinkmoth Well

Built for a world drowning in artifacts, where the right tap was nearly as good as a kill spell. The targeted ability reaches noncreature artifacts specifically, and the value lies in what tapping does and does not do: it cannot stop something on the stack, but it can pressure an activated or tapped ability by forcing it to fire early. Tap an opposing mana rock during the upkeep, and you can force its controller to spend that mana awkwardly or lose the use of it that turn. Tap an artifact that needs to itself tap for its effect (a combo piece, an engine that produces value each turn) and you have skipped one cycle of it. The two-mana activation and the tap-only effect (not destroy, not exile) make it a stalling tool rather than removal: it costs the artifact a single use, then everything resets next untap step. That narrowness is the price of a land that touches the board at all, since most lands do nothing beyond producing mana. It sits in the small family of colorless utility lands that bolt a niche artifact-disruption ability onto a basic mana source, asking nothing of your color requirements and little of your deck except that the table be running the kind of artifacts worth shutting off for a turn.