A single tool that lets me convert a deck's code to the code it had in a previous version (An example would be how the shards' codes changed and no longer work in some tools such as the Game Sim) and to a 'future' version (Moving a code from 1.29 to 1.31 etc.). This would save users a lot of trouble.
Problems:
New Cards
Notes:
I of course don't expect this to include every version's, just ones that would help in the case of a tool not being updated.
Instead(or in addition to), there could also be one table of current version codes and past version codes for cards.
~Just my 2 ideas~