A similar thing happens in the third Invaders movie, where you have this reaction after finding out that the Ferroseed you knocked out belongs to one of the fleeing citizens
It does all the usual shenanigans of drawing cards and becoming a massive threat as your opponents attack into one another, but tying those abilities into a Dragon-themed shell makes this commander feel wholly unique and interesting to build around
If Comeuppance has zero fans, I am dead
Add to that some nice lifegain and the option to cheat out nonland permanents and youve got a fun card to build around
Syr Konrad, the Grim and Teysa Karlov are just two commanders that would be particularly interested in these effects, as they allow you to further your game plan at the same time
They each arrive to the battlefield untapped and ready to tap for their color of mana so that you can basically pull a basic land for them easily enough and there is no tempo loss