Newer titles have moved away from the paradigm of the heroes of light collecting the scattered crystals in favor of broader, more convoluted plot-lines, but most games in the series still have a crystalline element somewhere
So in a Commander context, I see discard as the best way to describe a swathe of interdependent synergistic mechanics, mostly based in black, which look for advantage by quickly pitching their own hand to the graveyard
These are often the biggest draw to specific creature types
These events are meant to encourage competitive, cutting-edge gameplay and deck building, so get ready to test your skills in Standard Constructed
It's a staple across the multiple formats it's legal in, as getting ahead on mana is always going to be one of the strongest things you can do, especially in one-on-one formats