Magic: The Gathering

My Feldon deck isn't my best, but it's by far my favorite to play. Every time I do, I discover new fiddly interactions I hadn't even considered before. It's capable of getting out of the craziest situations with enough mana and shenanigans.

I recently threw in karn the great creator to test it out. Ended up wishing up rings of brighthearth from my binder, but it played so well in putting it in the main (not sure why I didn't earlier, honestly). My dilemma is I don't have many other artifacts outside the deck that I would really want.

Main question/TL;DR: what are some situationally good artifacts that could go in a mono red artifact/graveyard deck.

Decklist if you're interested. Not up to date but close enough.