Artifacts in Heroes III.

I wouldn't say that shackles are a good thing... It's an artifact with a catch, and it might even be detrimental, so I approach it with some distrust=))
But in my opinion, the golden bow, for example, and the sphere of prohibition are good=)) (I'm not talking about the Grail and the blade, as I consider them to be comparable in power, and after them, the game is basically pointless, IMHO).

They don't really decide anything - if you have so many troops that you can fight against artifacts of this level, then your opponent might also have a couple of decent mages and a couple of phoenixes with high speed - and you'll be dreaming about that famous blade for a long time. The golden bow is a useful artifact, but not the ultimate dream. At the very least, ending the game now is definitely premature.
And the best artifact is the one that helps me win - even a chain of gnolls, etc. - will do.