There is something very wrong with the anniversary souls.
My wife and I have opened about 15 between us, and they only drop Onyx Sons, Shardbornes, and War golems.
This is what a bunch of 8 gave:
From the event description, they are supposed to drop 3*-5* non-exclusive characters released in the past year. I am pretty sure there were more characters released than War Golems, Onyx Sons, and Shardbornes.
Anyone else having the same experience?