I rolled Corbett's gacha once with no luck. I have enough gems left for the worst case scenario (99 rolls for a guaranteed Corbett) but that would leave me with not nearly enough gems for whoever is next in line.

As for actual gacha luck, I spent another 50 salt tickets to get my total back down around 1000. First roll gave me a dupe of Mikan Orange (valentine) while the third roll gave me a new rainbow:
Tales from the Gacha-2-16-23-ornithogalum.jpg

Ornithogalum might be a good addition to one of my squads if I ever get around to attempting some of the high challenge maps again.