It's fine to use sleeves for ALL cards, but if you would like to get a few clear sleeves on your own for the cards that have different cardbacks, you'd need 116 clear sleeves for the Gameplay All-In Pledge: 10 stance cards for the character River, 12 item cards for Lum, 26 cards for Midori's Dragon deck, 23 cards for each character's main ability card, and 45 cards of stretch goals
The ultimate goal of these cards is to Summon "Imperion Magnum the Superconductive Battlebot" by fusing "Valkyrion" and "Berserkion"
SR Super Rare Fire Opal Head X FIRE Level 6 [ DinosaurPendulumNormal ] ATK 2500 DEF 1000 P Scale 0 This dinosaur pack leader with a burning head of stone is named after his finishing move
GENUINE VISUAL CLARITY: The extra clear polypropylene material displays all cards 100% translucent and clear
You can still play with them of course (in commander but not likely playable in standard)
The difficulty in finding these in near-mint condition today is a major price driver, most were pulled by young fans in an era before pack-to-sleeved grading culture was common