Razortip Whip

Drain by attrition, built for the deck that wins by inches rather than swings. A point of damage for a mana, over and over, is a deliberately inefficient clock: not a way to race but a way to convert a stalled board's excess mana into a slow, unblockable trickle. The targeting clause is the telling restriction. It can hit an opponent or a planeswalker but never a creature, so it does nothing to stabilize against a flooded board and everything to close out a game already decided in your favor. That makes it a finisher for grindy mirrors and a planeswalker-pressure tool rather than a removal piece. In the lineage of repeatable ping effects, it sits at the low-investment end: no body to protect, no creature type to enable synergy, just a colorless engine any deck can run and almost no deck needs to. Its honest job is reach, the inevitability that finishes a game the rest of your cards have already won, denying the opponent the handful of turns they would need to claw a few life points back into relevance.