So far, no cards with the OTC set code have been revealed, but well be updating this list as soon as we have further details
The bracket system looks at five main criteria: if the deck includes two-card combos (and how early you can use them) if it can take or chain extra turns, whether there's any mass land destruction, how many tutors are included, and how many game changers are included
You can leave the card out of the sleeve as long as the card doesn't go to your hand or your library
I would spend those slots on more topdeck-relevant things
Two cards with the same name can differ many times over in value depending on set, collector number, foil treatment, and condition, so you read those off the card before you price anything