The upshot of that is: they're going to let you have the treasure, and more often than not
Consign to Memory is leagues better than Ceremonious Rejection, because as well as the hard counter for colorless spells, it can counter triggered abilities
Drawing cards is one of the absolute best things you can do in Magic, and as a result the best ways to do it can cost some serious money
Ancient Adamantoise If you can get to 8 mana and play Ancient Adamantoise, you will be incredibly well-protected
The more important reason Gaddock was contained was that green wasn't a natural fit for the decks that wanted Gaddock, or in some cases green was but white wasn't, and his legendary status made it difficult to go too far out of the way to get him
All that to say, artifact decks will just love this all the same