It can be the creature that's about to deal damage, but it doesn't have to be
YCS Kansas City, the first major event following that structure decks release, saw it take three spots in the top 32, and the deck became a major force in the meta going forwards, but it struggled to top events like some other GX decks mentioned here
You cannot activate this card the turn you activate "The Seal of Orichalcos"
Much like Nicol Bolas, its a card that can come down early, pose a substantial mid-game threat, and then help close out the game late
Narratively, this serves as a wake-up call that he can't keep relying on Time Wizard and his luck to bail him out of a jam and he needs to use more strategy going forward
Considering the number of Chocobo cards were getting in Final Fantasy, theres a good chance these are quite popular soon