How to counter Phantom Assassin

In lane

Pudgeofflane
• Pudge has way more stats to work with in lane. • Rot does not care about the evasion of Phantom Assassin. • Meat Shield is excellent at blocking her damage early on. • Phantom Assassin's big power spike is Black King Bar. Dismember goes through it.
Viper
• Viper can Poison Attack her in lane to slowly chip her to death. • Unless he is totally alone and it's a bad situation for Viper, even if he gets jumped by her and her support in lane, he will probably kill her due to the combination of Corrosive Skin and Poison Attack. • Viper Strike is an excellent break for Immaterial, nullifying her evasion. It also goes through Black King Bar.
Axe
• Counter Helix is excellent against her relatively low HP and evasion. • This is a historical counter because in most games and at any point Axe can kill Phantom Assassin with the combination of Blink Dagger + Berserker's Call + Blade Mail.

Winter Wyvern
• Phantom Assassin is an explosive hero which means Winter's Curse can make her murder a teammate immediately. • Cold Embrace is a great save against her physical damage. • Phantom Assassin's big power spike is Black King Bar. Winter's Curse goes through it.
Oracle
• Phantom Assassin is a relatively low health hero which makes the Purifying Flames + Fortune's End damage combo strong. • She has no organic dispel for Fate's Edict disarming her. • False Promise can save an ally, potentially wasting her Black King Bar duration.

Ghost Scepter
• You need this item to save yourself from her jump and burst potential.
Monkey King Bar
• Phantom Assassin's biggest strength is having evasion with Immaterial. This item totally nullifies evasion.