Blooms are a guaranteed reward after the single pull (I pulled bronze Ipomoea Nil ) going to your giftbox.
The next pull is a 100% Victoria pull going straight to your collection, so not through the giftbox.

So a rainbow skillbloom and a rainbow dressbloom for 4500 NGold, which is a bit expensive (If I were to value them, I'd put them at 1,000-1,500 NGold a piece), but the Victoria pull after does make up for that, so overall, I don't think it's a really bad deal.

And yes, Victoria is a very solid girl. Not special in any way, but an AOE + ATK buff + DEF buff is very solid and should fit in about every team.