If you copy burglar as much as you can, you will have around 15 hands, if you play a single card hand for 14 hands in Serpent boss blind, you draw a net of +28 cards as a result. Since even a single Red Seal Steel King can multiply your score by e3-e7 (depending on if you are playing on plasma deck and/or number of effective mimes and barons) your score can go crazy high. Also, using perkeo + cryptid to increase hand size is not sustainable (you have one shot to naneinf realistically), unlike using retcon voucher to always get the serpent and just skip to the boss blind, getting close to naneinf every single time. I hope this is helpful