Heidar, Rimewind Master belongs in your snow deck to help you bounce problematic permanents back to your opponents hands, but a mono-blue commander for our snow deck just isnt it
As a bystander to the format, I can say that before Modern existed, the Extended formatwhich encompassed anywhere between the previous 4-7 years of Magicwas much maligned
But this card has such mad value, right
Its also important to note that Primal Vigor is a symmetrical effect, doubling counter and token creation for your opponents in addition to you
My general preference is to pick up a mana dork, then a Ghostly Prison, then Sanctum of Stone Fangs, though you can adapt to whats in your opening hand and the most pressing threats on opposing battlefields
The photocopy will not only be unable to copy any non-copy effects that affected the target creature, it will also be unable to copy any copy effects that it can't see