2022. 7. 19. · In my very first submission, I will be talking about staples. Staples are key in early deck building, because they set a good foundation for decks that are not yet complete. Staples are cards that work well in almost any deck. Staples can be any kind of card. Certain spells and traps work good in different ways. Most trap staples defend against attack from the opponent,. Best cards of Yu-Gi-Oh! Master Duel SR rarity. Solemn Warning: When a monster(s) would be Summoned, OR when a Spell/Trap Card, or monster effect, is activated that includes an effect that Special.