What you were expecting to happen, and what actually happened?
Computer had Soothsayer, so I used Mercy to turn all purple to yellow which resulted in no purple on the board. Computer used Soothsayer and it was able to use ability on bottom left corner gem
What are the steps to make it happen again?
Take all purples off the board and computer uses Soothsayer.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
None, all it would show is skeleton having 0 purple mana, but no that soothsayer just casted.
I was surprised the computer was using skill, then surprised it did something without purple.