Razor vs Viper

How this matchup plays

Standing your ground is what both these heroes want to do, which creates a tense standoff. Viper has a clear advantage when he can place Nethertoxin, as it disables Razor's Unstable Current passive. This lets Viper's slows and corrosive damage stick without getting purged, allowing him to kite effectively. The entire dynamic flips, however, if Razor can apply Static Link. Viper has no natural way to break the tether, and once his damage is drained, he's left completely helpless. The fight is won by whichever hero gets to apply their key spell first, making positioning and initiation the deciding factors.

This "first move wins" situation persists throughout the game. A successful gank or a better opening in a teamfight usually decides which of them gets to take over. Because both Razor and Viper excel at singling out and shutting down one target, they often end up focusing each other, nullifying their respective contributions. Neither can really burst the other, so their duel becomes a slow grind that depends on which team provides better backup. They fulfill such a similar anti-carry role that they tend to cancel each other out, leading to an even exchange where neither can establish a consistent upper hand.