This makes sense from a lore perspective, as the plane of Mirrodin, which we now know as New Phyrexia, was created by the artifact planeswalker Karn and was originally called Argentum
There are so many +1/+1 counter synergies these days that its incredibly easy to make an oppressively powerful deck with that strategy, and I personally dont like the mental energy required to keep track of all the various triggers those strategies accumulate on the battlefield
This has most of it's appeal in a tribal build
That's why it's my top permanent token copy maker
Dropping him once you have an established board can get you very close to an instant ultimate, but dropping him early is still great, because he can make the way for your Ninjas to connect while giving you card advantage
You can flicker away those finality counters with ease