Many of the most expensive cards from Dominaria Remastered are cards that are already in high demand among players, cards like Force of Will, Sylvan Library, and Urza, Lord High Artificer
Its rather restrictive since you need to be mono-black or close to it, but it's worthwhile
Codsworth, Handy Helper has seen its price skyrocket, too, thanks to some Final Fantasy synergies, while Silver Shroud Costume is still holding a decent value
Icetill Explorer (Fracturefoil) Market Price: $354.63 The most valuable of the fracturefoils, Icetill Explorer does a whole lot for one card
We pay mana for cards all the time, and other spells always say something about the exchange rate of cards to mana