When my creatures are killed vultures, boneyards and bone walls are acting as though an additional creature has been killed.
eg. 1 creature died.
vulure gets +2/+2
boneyard generates 2 skeletons
bonewall gets +4 bones
2 creatures died
vulure gets +3/+3
boneyard generates 3 skeletons
bonewall gets +6 bones
This happened to me in 3 AI3 matches, 1 AI5 match and 4 top 50 matches.