Thanks a lot for your suggestions.
After trying the deck, that was suggested earlier (which sucked very hard for me, but maybe I just played it wrong) I switched back to my original deck and followed the hints from linkcat.
This works pretty well, at least on lvl3 enemies. I'd say it wins 8-9 out of 10 matches, although it is still somewhat luck dependent on drawing enough pillars early in the game, because fewer pillars combined with 1 or 2 devourers or a lobotomizer from the enemy are almost a guaranteed loss.
But I suppose it's like in many card games, sometimes you just have bad luck
![Wink ;)](https://elementscommunity.org/forum/Smileys/solosmileys/wink.gif)
Anyway thanks again. Maybe I'll try some t50 or lvl5 soon, but I fear they'll crush me easily^^