Expressive Iteration

• WWizards of the Coast2026-03-20
  Official Ruling
  If you don't play the exiled card, it remains exiled. It won't be available to be played on future turns.
• WWizards of the Coast2026-03-20
  Official Ruling
  If you choose to play the exiled card this turn, you must still pay all costs and follow all timing restrictions required by that card. If it's a land, you can't play it unless you have a land play available.
• WWizards of the Coast2026-03-20
  Official Ruling
  If there are fewer than three cards in your library, follow the instructions in the order given for any cards that are there. For example, if there are two cards in your library, you'll put one of them into your hand and one of them on the bottom of your library. You won't have the option to exile either of them.

Rulings via Scryfall

• WO
  Wizards of the Coast2023-03-06

  Expressive Iteration was banned in legacy on March 6, 2023. Our choice is to ban Expressive Iteration, as the card quality and quantity it provides allows Izzet Delver to easily adapt to stay on top of any changes in the metagame. In addition to removing a generally strong card, our hope is that by removing Expressive Iteration, we reinforce Izzet Delver's historical strengths (efficient one-for-one exchanges) and weaknesses (lack of sources of card quantity) in a way that leaves the deck more vulnerable in the metagame. Source: https://magic.wizards.com/en/news/announcements/march-6-2023-banned-and-restricted-announcement