Tournament rule 602.4.a.5

A sealed deck is still legal if it has no Champion Legend or Chosen Champion.

• 602.4.a.5.a A player may opt not to use a Champion Legend or a Chosen Champion in their sealed deck even if they have one in their…
• 602.4.a.5.b If a player's deck is missing a Champion Legend and/or a Chosen Champion, they draw a card at the start of their first…

Official Tournament Rules