Is a chosen champion required in your deck, or can you play a deck without one (e.g., an Annie deck with no Annie)?

Ruling: In casual play, you can play without a chosen champion. In sealed format, you don't need one as there are explicit rules allowing this. In any OPL setting above sealed (competitive tournaments), you must have a chosen champion.

Nuances:

• The chosen champion is not strictly a deckbuilding requirement in the comprehensive rules, but rather a matter of game setup
• Tournament rules (higher OPL) require deck registration which requires a specific chosen champion to be registered as part of the deck
• The chosen champion counts as one of the 40 cards in your deck