It can turn a larger artifact into a smaller one right away, or turn a smaller artifact into a more expensive one with a bit of a mana investment
Apocalypse Penumbra Bobcat Penumbra Kavu Penumbra Wurm Penumbra, while unnamed, was the first mechanic to use creature tokens as the core of the mechanic
Youll have too many other cards that need colored mana that it cant produce anything but colorless for, so it actually ends up being a pretty big hit on your mana base
For example, suppose I attack with [c]Zetalpa, Primal Dawn[/c]
The second reason I think it makes Magic better is that it disrupts the expected flow of the game, it mixes it up and allows situations where turn two things are happening on turn one
Not sure if any silver bordered cards have this, but it could be a funny idea