As a follow up, I posted this question on the "YuGiOh Duel Generation Duelist Kingdoms United" Yugioh Duel Generation fan group on facebook, and someone name Mera Utopia replied with this: "A decent dragon deck with only "free" cards is possible
The only giveaway left is that it has a significantly glossier back than a real card, even more so than a real card with Japanese printing (they are known to be glossier than US-printed cards)
This means that aside from ACE SPECs specific to certain Pokmon (Crystal Wall, Crystal Edge, Victory Piece, etc.), any ACE SPEC can be played in ones deck
Orcish Bowmasters Okay, you dont really play Orcish Bowmasters for the enters ability, but its such an amazing black card
Its attacks had a relatively low cost and dealt a ton of damage