Barring specific deck strategies, well want to make sure we have a decent ramp of cards to play at each ink cost, without making us too top-heavy
While it is true that a few of these cards have now been Masterpieces twice (Mana Vault, Ancient Tomb, Through the Breach), we need only look as far as Mana Crypt and Sol Ring for examples of cards that have had multiple rare and shiny versions that have tended to trend upward together once the Masterpiece started to rise
One of the board wipes benefitted me immensely, as it turned out because it kept an angel-making enchantment in place, and every time I played a new enchantment from my hand, I was able to spawn more angels
Being able to cast a 3- or 4-drop for free after playing this card is stronger than cascade, and we know how powerful that mechanic is
The same is true if the creature is destroyed but instead of going to its owner's graveyard, a replacement effect moves it elsewhere, such as exile