While having the flexibility to draw cards impulsively is nice, this isn't true card draw, and you are limited to playing them that turn
The five-mana commanders instead focus more on ramp on turn three, which can often accrue more value than spells that cost less, but still help with the game plan of getting a commander into play a turn early
Energy is something that comes natural to these kinds of decks as well, since Harnessed Lightning is a cheap way to remove creatures and generate more Energy to feed to Lathnu Hellion
It was inspired by proliferate from Scars of Mirrodin , which allowed you to put extra counters on cards that already had them
Want an example list
Although far less proliferated compared to Affinity and Equipment, Imprint has stuck around across a handful of sets (mostly related to returns to Mirrodin ), and has even branched into non-artifact cards more recently