How to make Eye of Skadi work with Diffusal Blade on illusion heroes?

 

How do you make the illusions burn mana but the hero have Eye of Skadi?

You drop both, then pick up Eye of Skadi first, then Diffusal Blade. Your hero will now slow and your illusions mana burn.
Only really relevant on Phantom Lancer though imho

Naga Siren needs Radiance, and Terrorblade's illusions are better in ranged mode so Diffusal Blade will be less useful.

Passive abilities that illusions can't use (even if the animation might show something different):

• Raw damage or armor 
• HP or mana regeneration 
• Orb effects (except Feedback on melee illusions) 
• Cleave 
• Bash (it works in some rare scenarios, read more about it below), this includes the interrupt on
  
  Monkey King Bar 
• Damage block 
• Spell resistance from Planeswalker's Cloak, Hood of Defiance or Khadgar's Pipe of Insight
• Backstab 

So unless something's been changed...no

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