In the end, I think all of that makes this a 3.0
Do note that you do need to target the Commander, so you may need to get through a field of hexproof or shroud
In case Arcades is removed, his Commander deck has cards like Assault Formation to keep the defenders online, and the deck can even "flicker" its defenders so ETB effects like Arcades' own can be used all over again
Market Price: $99.45 Typically, you see Echo of Eons in flavors of Storm and Charbelcher in Legacy and sometimes appearing in lists led by Nekusar, the Mindrazer in Commander
For example, an alpha and beta Black Lotus is going to be worth a lot more than an unlimited and revised Black Lotus, just because it was from the rarer, harder-to-come by initial release
If the affected creature gains an ability after Kenrith's Transformation becomes attached to it, it will keep that ability