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It's healing factor from Shining Feathers adds a competitive layer to this beautiful card
If you detach this card from an XYZ Monster to activate an Effect during the Battle Phase, you can double the attack of all Number XYZ Monsters on your side of the field
But I think this era is most characterized by Wizards starting to consciously design cards for the format, such as Ken Nagle designing Wrexial, the Risen Deep for the purpose of having a general to help combat players who used a lot of Time Walk and Time Stretch effects within their deck
You only get to do this two times, then it defaults to a generic 6/5 creature with trample, but you're either going to get two free spells, or you're putting pressure on your opponents to remove a potentially game-ending problem