They can significantly impact a cards rarity, desirability, and market value
The only major downside to Griselbrand, outside of its legality issues, is that the card is very hard to cast
So its fair to say that, with the expanded audience that MTG now has, the prospect of another Modern Horizons set, which brings back long out of print cards with fancy new art and treatments, as well as plenty of new ones, is a very exciting one indeed
And Im not just talking other equipment, but other equipment that can do a similar thing
This is also an ability with a strong long-game as you send stuff back to your library that adds more and more value
The Foundations Starter Collection is described as the next step in the beginner's journey, and has 350+ cards total, plus three play boosters