What are the deck construction rules for Sealed Champion format in Riftbound?

Ruling: In Sealed Champion format, you receive your preconstructed champion deck plus 3 boosters total (1 initially, then 2 more), and must build a 40-card deck with two domains following standard constructed deck requirements.

Sequence:

• Receive your champion deck plus 1 booster
• Receive 2 additional boosters
• Build a 40-card deck with two domains

Nuances:

• You can only include cards from the boosters that match your champion's colors (e.g., if playing Jinx, only red/purple cards from packs can be added)
• Local game stores have flexibility to implement variations as there aren't official rules for this format