Dead Fairy is super squishy, and can easily be 1 turned if he is in a bad position. Or keep engaging it since it's minimal range is 5.
Relocation works well, outrange it where possible. Single target spells that incapacitate is also another option
You play KF, at least 30% of your champs have the same/higher range than fairy, easy power turn with your +2 max ap
"You play KF" is not a reason for me to be unable to beat it. Also, what if I want to play split, or even a different faction entirely? Anyway, I'm beginning to really hate the you can't heal aspect of diseased. Especially at range.
Killing Dead Fairy is about learning to move around the FW front line, which is going to depend on your map and your tools. If you are running Carnivorous Vines or Brambles, use those to pin down the Fairy and set up for a kill. Fairy relies on her mobility to stay alive, and if you can remove that, she's a ~40 hp unit with 0 defense.
Honestly, Firk healing. I don't see what the problem is with disease countering healing. You know why? Because there is no problem! HAHAHAHAHA!
If you hit him once with a Magic dmg unit, he will lose Incorporeal. And then you can hit him with everything.
Yeah, I guess. Or any other Magic dmg unit. Oh btw, a cool thing (that all the SL players are keenly aware of I guarantee) is that Imbue Stun makes the Imbued unit's next attack Magical.