I went back to the Rebels here, but I added a little more preemptive exiles and such to see if the killing could get started. It probably needed to play up shadow and add Farrel’s Mantle, though I may have been on a self-imposed ban on that card at the time. The 8/15/15 curve comes in at just 2.18 average, but the compact nature of the curve makes the higher mana content a questionable choice. It is likely I selected it because of the number of spells that require multiple mana of a specific color.