If you dont have the mana for the card Transmute Artifact tutored for, or you simply dont wish to pay it, you can just let your tutored card go to the graveyard like a more expensive Entomb, allowing you to bring it back later with an effect like Reconstruction or Argivian Restoration
Neither creature is ever affected
Creatures can be vanilla, and you can still tap them for convoke
Again, this isn't to say reactive answers, like generic removal, aren't good
Vintage kept its restricted list, because some people wanted to play with powerful cards (and also because Type 1.5, aka legacy had started to take root, which, at the time, was just vintage with the restricted list renamed "banned list"), but in standard, you already couldn't play with all your cards, so there really wasn't any good reason to keep a restricted list
This creates further incentive for your opponents to not attack you, helping to keep the cards flowing in your direction