If a replacement effect causes the evolve ability to put more than one +1/+1 counter on Watchful Radstag, its last ability triggers only once
This is a completely legal thing to do, even though it seems strange
While it looks tough to access at first, the card essentially gives you two land drops itself, one on entry and one when your Earthbent land is inevitably removed somehow, so it shouldnt be hard to get going
While having a couple of newer versions (Thalia and The Gitrog Monster & The Gitrog, Ravenous Ride), I have this one as the best one
At that point you're probably reanimating it, and doing it all again, and it's a huge out-value engine
On top of tutoring all kinds of powerful artifacts, from Sol Ring and Shadowspear to Pithing Needle and Colossus Hammer