The reason I have Serum Visions ever so slightly higher is that it is still very very close to Preordain in general all round power, it typically gives more overall information as well (if you keep at least one card from a Preordain scry you see one less card overall than you do with Serum Visions or Ponder), but most of all it is becuase Serum Visions affords you the best synergy with top of library effects
We know artifacts are popular, we know people love their colorless tentacle beasts, so Ugins price will likely stay high for a while, even as the premium versions drift lower
This can help to stick a Poison counter on a tricky opponent before Proliferate can do the rest
Legends of Runeterra stands apart from the many, many other sort of Magic imitators Ive tried over the years, in that its developers were able to take three decades of hindsight and iterate on some of the OGs weaker areas
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(3) A monster equipped with this card cannot be destroyed by battle