While this ability is already potent, Jin -Gitaxias forces one's opponents to potentially waste their resources, automatically countering the first instant, sorcery, or artifact an opponent would cast each turn
That doesnt mean you can use one as the king and just add the others as a regular part of the deck, and because of that
What complicates things (and as already mentioned, makes many Commander players dislike this effect) is that your opponents are drawing a fresh grip of cards
It's on curve, strong
I think it hangs up there with the best of them, really solid card
However, while that deck's commander, Prosper, made a treasure every time the player casts a spell from exile, Faldorn makes a 2/2 wolf token