Gray Merchant of Asphodel, Blood Artist, and Ayara, First of Locthwain all come to mind as powerful inclusions, and there are many more to discover
In an Eternal format like Commander, players have access to so many cards that you can take an otherwise basic mechanic (like gaining life) and turn it into so much more
One of a handful of "evergreen" mechanics that is included in every set, it's considered a fundamental part of the game alongside the likes of trample and lifelink
In order to continue the process, the roll was attached to the beginning of another with the tape
In the comments, let me know which of these rules changes you like, which you dislike, and if you yourself have come up with any potential rules youd like to share