All in all they are great cards, they are pretty skill intensive as lands go and offer lots of choices for deck design as well as in game, they are a lovely design which improves magic and are not of a power level where they are always an auto include
Some of the rare cards include Machop, Psyduck, and Meowth
My Verdict: If you want stunning art and a collection that looks like it belongs in a saga, Kaldheim delivers
Getting back a board full of Dreadhorde Arcanists, Young Pyromancers, Kroxa, Titan of Death's Hunger, and friends in the mid- to late game seems pretty powerful
And they'd often toss in Sylvan Library too
Start by researching market prices to avoid overpaying and to gauge box value