Also whir of invention would be a lot better signature spell as its instant speed and technically cheaper with the improvised
Whir was my initial choice, but I realized that most of the artifacts add mana anyways, so it ends up being cheaper to
reshape (although the sac might end up being an issue, need to do some testing on that).
And don't get me wrong, I LOVE the idea of Oathbreaker. I think there's a lot of really really fun things to do. This is just some evidence that the format needs a bit longer of a banlist if it doesn't want to be solved like Tiny Leaders.