I have submitted a game log for anyone interested. It's intended for direct entry into Excel, as opposed to as a printout. You can also use it to record deck lists. From the description:
A game log where you can record the following about each play: date, scenario name and mode, player and deck names, outcome (for each player as well as overall for the group), score, and session notes. Another sheet allows you to record your various deck lists, which also calculates starting hero threat and the number and cost distribution by both sphere and type; space is also provided for win/loss stats by scenario for each deck and notes on how the deck played against certain scenarios. Included are tabs with examples.