How to counter Kunkka

In lane

Lifestealer
• The debuff immunity of Rage ignores every spell of Kunkka. It also makes it impossible for Kunkka to set up combos with X Marks the Spot. • There is little Kunkka can do about Lifestealer hitting him at every stage of the game. • Feast is good against high HP meaty heroes like Kunkka.
Juggernaut
• The debuff immunity of Blade Fury ignores every spell of Kunkka. It also makes it impossible for Kunkka to set up combos with X Marks the Spot.

Black King Bar
• The debuff immunity of Black King Bar ignores every spell of Kunkka.
Eul's Scepter of Divinity
• You can use this item to cyclone and save yourself from X Marks the Spot combo. Good timing is required.