tired elm
(Perkeo, Blueprints, Brainstorms, Invisible Jokers (x2), SocknBuskin, Lucky Cat, Red Seal Kings, Baron, DNA, Mimes)
I saw everything and made the stupid mistake of selling Perkeo cause I thought I would die.
You get perkeo early-ish and if you survive you get the Observatory in the later rounds. I didn't have perkeo and made it to ante 12 without that potential.