From the 2.0.1 preview thread:
Obviously this has the potential to impact some troops much more drastically than others. Some troops don’t have Magic at all, and for some (like, say, Alchemist or Valkyrie) the Magic stat dwarfs the side effect of their spell. Others live and die by Magic.
I for one am excited to use it on Gorgotha, for the lolz. More meaningfully, Mab can lose some (but not all) of her punch if she’s Webbed.
Which troops are you looking forward to Webbing?