Snapfire + Viper

Why this works

Stacking slows from Viper and Snapfire seems like a surefire way to lock down a target, but in practice, it’s often redundant. An enemy slowed by Viper Strike is already crawling, so adding more slows doesn't change their situation much. The main issue is positioning. Viper wants to be on top of his target to apply damage and sit in his own Nethertoxin, while Snapfire needs to be far away to safely channel Mortimer Kisses. This can leave them fighting on opposite ends of a skirmish, unable to effectively protect or follow up on each other.

The combination works best when you catch a single enemy hero completely alone. In that case, you can delete them before their team can react. In larger teamfights, however, things get messy. Enemies can often choose to either jump the backline Snapfire while she's a sitting duck, or collapse on the forward Viper while his partner is too far away to provide anything but long-range fire. The success of any play depends heavily on the enemy team's ability to exploit this positional split, making the duo's effectiveness feel inconsistent from game to game.