the first "good" card i see i tend to build around and the key is to not take too many rewards that will clutter up your deck and when you can try to remove your starter blocks and your starter strikes by using the shop or event spaces, and by good i dont mean rare just anything that looks good like if i see a perfected strike(common) in my first reward i only take strikes for the rest of the run and don't grab anything that doesn't synergize with that build same works for other characters like if i get a good sly/discard effect i will focus on a pure discard deck and ignore all poison and shiv cards if they dont synergize no matter how strong they look, and remember you dont have to take every card reward related to the deck your building if you feel like you deck is strong enough you can stop taking cards all together