Tournament rule 402.1
In a constructed event, players must register a Main Deck of exactly 40 cards (including a chosen champion), 1 Legend, 12 runes, and exactly 3 battlefields each with a unique name.
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In a constructed event, players must register a Main Deck of exactly 40 cards (including a chosen champion), 1 Legend, 12 runes, and exactly 3 battlefields each with a unique name.