I think what @thrugl was saying is that he replaced the EASY/HARD mechanic of being a +3/-3 with changing the die type rolled from a D20 either up to a D24 for EASY, or down to a D16 for HARD.
The Stunt Die
thrugl
#22
Exactly as @The_Merlitron said
For Deed Die I just use it as written in DCC, scales up with Milestones instead of levels and it only apply it to checks, not effort (I quickly found it a bit overpowered for damage)