
Whenever you cast an artifact spell, you may draw a card. If you do, discard a card.
Riddlesmith has 4 printings, first in Scars of Mirrodin (2010). EDHREC ranks it #5,579 among Commander cards. It appears most in Golbez, Crystal Collector decks (5,177 on EDHREC). 1 public deck on TCG runs it. It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.