The Casual draft uses the following process:
1) Form a common pool of unique Champions, with a minimum of 6.
2) The second player drafts 1 Champion.
3) The first player drafts 1 Champion.
4) The second player drafts a second Champion.
5) The first player drafts a second Champion.
6) The second player drafts a third and final Champion.
7) The first player drafts a third and final Champion.
8) Each player should now have a team of 3 Champions. Return any remaining Champions to the game box.