Has anyone else unlocked Think? I can't seem to get it

have got everything else I've seen mentioned - wondering if my character isn't intelligent enough :p
I will test chop damage with a sword quite soon, im sure people have since i've seen a few swords floating around...
Another question... What do people think of decks with more than 5 cards? I miss the old days of legacy where you had hundreds of things to choose from. Right now if i put more than 5 cards, I can get royally screwed by rng and potentially get nothing i can use at the start of combat... Wondering if anyone has any tips to make a more varied deck work.