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To be honest, my friend and I tried to collect all the artifacts and test their compatibility on an incredibly challenging map (we played mage against undead, and the map had mentors, so we tried all possible hero build options). We found that the Sar-Isa wasn't very effective for mages in the end; it became useless. The dragon is, of course, overpowered, but we didn't use it to avoid creating imbalance with level 7 units. The Necromancer's Cloak is simply amazing, especially for undead. The Urgash's Will is also overpowered; it's easy to acquire and is an incredibly good item for infernals (I used it in another game, and it helped a lot). The bow is an excellent item (no further comment), especially with 30% initiative. The dwarven item is also very good; it took us a long time to figure out how to counter it with undead! I didn't use anything else. I also want to talk about some straightforward artifacts, like the Crown of Leadership and the Amulet of Superiority (I think that's what it's called, the one that gives the hero a 4th-level skill). The Crown of Leadership is just... well, it's amazing. We found Leadership and the Crown for the undead, and it created complete chaos for the opponent. The Amulet is also very good. So, composite artifacts aren't always the best, and you can find excellent single artifacts (in my opinion)