Its not hard to make permanents leave the battlefield regularly, especially when the other permanent in the command zone can bring a lot of them back
Second, the card simply either takes too much mana, too much time, or too much setup to broken
The Sogeking comic parallel has held steady in the 40,00070,000 range (varying by condition), while leader parallels like Nami have consolidated around 12,00013,000
It adds Baby Pokmon, new Evolution rules, and introduces the Metal and Darkness types
Fortunately, it's not a deck that is particularly popular, but if that changes that would be a significant strike against playing Dimir Demons (or any Black midrange deck, really)
When we do this, we can see there are 30 available options