Board Thread:Questions and Answers/@comment-121.7.52.161-20140210102655/@comment-6518600-20140211001920

A deck may only have 52 cards (no less, no more) with:
 * 1 being your monster for buddy zone. (This 1 card is not included in 4-copies-only rule)
 * 1 being your flag card.
 * 50 being the cards that stays within the deck at the start of the game (before you draw a card), which may only contain monster cards, spell cards and impact cards.