Talk:Fifth Omni Dragon Lord, Tenbu/@comment-27276068-20150313002721/@comment-4764137-20150313011200

Official Q&A from the original rules pamphlet states:

Q: Including the card I chose as my buddy monster, am I allowed to have only 4 of the same monster cards?

A:  No. The card chosen as buddy is from the 4 copies within the deck. So, with the monster chosen as your buddy, it is possible to put 4 copies in your deck and the same card as your buddy for a total of 5 copies.

This is word for word. You have 4 copies within the deck, stated by the rules. Also, the rules officially do not count the flag or the buddy as part of a deck. Your deck must consist of "50 cards, plus a flag and a buddy". They are NOT considered "part of the deck", for any rules or effects considerations.