This week's card of the week is the 2-star Opal Carbuncle, a great addition to any Carbuncle file, his open skill can greatly increase the file's power against Gowen files, and any files that rely on direct damage in the open phase. As a nice bonus, his counterskill combos well with Diamond's attack debuff, and the possible advantage it gives you makes the enemy think twice about attacking.
"Scissors are overpowered. Rock is fine." -Paper