User blog comment:Starchythepotato/Oulu, Altri and Will Awakened! (7★)/@comment-116.14.51.191-20150709214117/@comment-118.99.77.26-20150814040203

and if we talk about probability, 50% chance for 6 units will give 3 random units out of 6 getting the angel idol effect as compared to ivris 100% chance for 2 random units out of 6 getting the angel idol effect.

Of course it may vary, but most of the time veltri's UBB will give 2-4 units getting angel idol effect.