Most important is the numbering, and the obvious fact that Berfomet and Gazelle should be in here too, since Chimera was confirmed previously.
Gaia the Dragon Champion is SDMY-JP044
Gaia the Fierce Knight is SDMY-JP013 (And is the WJ-01 Art from the very old Limited Edition 2: Yugi Pack promotional pack)
Curse of Dragon is SDMY-JP014