Just like the core FF games, these are powerful artifacts and weapons that buff your heroes with better stats and abilities, and there are plenty of cards that will help you build a party around your items and go digging through your deck for the best ones
I also always use a few resources when researching a topic
The My Little Pony: Friendship is Magic Squaroes hold up to 100 standard- or Japanese-sized trading cards (from games like Magic: The Gathering, Pokmon, Lorcana, Flesh and Blood, Yu-Gi-Oh!, Riftbound, and One Piece) in double protective sleeves*
Successfully killing the Invisible Stalker will take the Unflinching Courage with it
Exile Game Plan
Nuka-Cola Vending Machine is also pretty below rate, but churning out Foods every turn and giving you Treasures when you sacrifice Food are both powerful, even on just the standalone card