The incredible new Astral Dragon is a fantastic Commander card on its own, and if you happen to have a Cursed Mirror on the battlefield when you cast or otherwise bring Astral Dragon to the battlefield, you create two tokens that are copies of Cursed Mirror, and have those Cursed Mirror copies enter the battlefield as copies of Astral Dragon, which will enter the battlefield and can create two copies of Cursed Mirror, which then you get the idea
Sapphire Sapphire is eating good this set
Defacing Duskmage has a similar outcome, though you have to cast its prepared spell before you actually benefit from opposing card draw
And you still are motivated to keep leveling him up, of course there are worlds of difference between a 5/5 with flying and a 10/10 with flying, first-strike and indestructible
On the other hand, this seems like exactly the sort of thing where we may turn around a year or two from now to find out this was just beginning to seed a bunch of cool cards