I remember getting gilded counter titan on hardcore mode back when the multiplier was still x2 on megabosses. 2.4 million hp, was faster than a rainbow devastator gojo, and could one shot a prism titan. I was the only one who survived that encounter, and that was only because it someone managed to freeze it. It gave us 50k trophies.
You can't get it but I will explain so it's a secret rarity like gojo and gilded duo and it was a 1 in 2000 to get in easter case and it works like 100m event and at that time the pity didn't exist so you only had to gamble the case for it also it's called rainbow devastator and it was the first thing in super toilet brawl to have a secret rarity