This deck name is a reference to the five stages of grief: denial, anger, depression, bargaining, and "playing a real deck."
I saw someone playing Alhed + Killer Grief on ladder and decided to run with the idea about 5 minutes before the ECL Tuesday Weekly started. It was as reliable as you might expect (very not) but absolutely stupid when it went off--this is an updated and working version of the deck with the campaign cards that came out the following day.
In the example game footage, I come across the person who gave me the deck idea for a killer grief showdown. Check it out here: https://youtu.be/9PqIOSD0M7U