Hello, the readme and also the handbook do not mention how one could defend the "eye" card (Donsol). I guess its impossible?
Beside of that great game btw!

is it even possible to win?

Of course it's possible, you can't show up to fight a Donsol without a shield tho. It will destroy any shield, but if you have enough life, you'll take the left-over damages from the shield breaking and loose a bit of life, but it won't kill you.

Here's a little gif where a Donsol is killed.

https://merveilles.town/web/statuses/107140113477738426