Worth of mention is that as of the beta version
this card along with other cards that weaken can complete invalidate cards that need to be destroyed to trigger their deathwishes
ex: i was playing with the Skellige's deck and played Kambi my adversary played mushrooms card and weakened kambi, i hoped that this would trigger Kambi's Deathwish but it didn't, the same happened in another match were mushroom card weakened my Iris spy card and didn't triggered the card deathwish.
Mutagen: Increase base strength of a non-Gold unit by 4.
Spores: decrease base strength of a non-Gold unit by 4.
IMO this card is poorly explained. I didn't use this card for quite some time, wondering what is Mutagen or Spores effect. You guys need to have a better explanation, when people explore their deck.
You can see the detail on this page.
Thanks! That description was very helpful.