It generates energy counters equal to the number of nonbasic lands an opponent controls when it comes into play, and then allows you to spend four energy to destroy a nonbasic land and make nonflying creatures unable to block each time it attacks
Its especially scary to see this on the table in a Fynn, the Fangbearer deck with the commander out
I spend most of this article going into the details of how I hacked the tooling a bit to make the process a bit easier for me, but here are the result: I also made a custom engraved deck box to hold the results: Card Boxes The Card Images The Printed Results I dont go into much details of the process of printing the cards, but I cover that more extensively in my previous post on the subject print magic card proxies
Given how Steamflogger Boss, the first Contraption card, actually debuted in a black border set, that would probably be most players first guess
The Companion mechanic alone broke that, allowing players to access a card from their sideboard as long as their deck met the right conditions
Today, Im focusing on the latter, although D&D will get its due on A Reception Collection soon