Extremely rare, such as The Fifth Personality, Green Touch, Steampunk, Game King: Duel Link, etc. (equivalent to SSR in some games, even higher than SSR).

Sr: Ultrarare is extremely rare (rarity is generally lower than SSR).

R: Rare is rare (rarity is generally lower than SR, and some games can be used as the upper limit of rarity for cooperation/friendship/auxiliary points).