No kidding. I hadn't picked up BB or original Sakura yet so it was nice getting them for free along with another equipment slot for Mei, Cactus and Red Ginger. I did a single roll of the X-Mas Elder Flower gacha just now and picked her up, so that's six rainbows in a single day for 50 FG.
Speaking of, Elder Flower seems designed for defensive squads given her abilities (+35% defense, 1.2x skill proc, 30% healing every three rounds, HP drain equal to 5% of the damage on skills - 50% max HP cap on healing per activation, +50% max HP). She also provides a 15% heal to a random squad member who got attacked during a round and 3x Guts for herself.