Lv 30 Lawful/Evil Human Dungeon Master
In Toruk's name!
It's not in the draft rules because it's in the standard rules for game setup (pg. 8)
2. Setup capital boards.
Each player should select the Capital Board that best suits his deck, and place it on the playing area in front of himself.
Theoretically a capital board is not part of your built deck, it's decided every time you setup for a new game.