Cosmo Blazer, however, has a variety of nice things, including the potentially-good-but-bad-right-now Heraldic Beasts, the very interesting Haze Beasts, the Flaming Star archetype (which I've brewed but I feel to be only okay), and Pyrorex the Elemental Lord; most of the additional Mermail support is pretty terrible though ... Abyss-Cetus might be playable as a singleton.
Of some competitive interest also is Orbital 7, which serves as a brilliant Machine Duplication target to use to make a 3-material Xyz with (free stuff is always cool). My friend pointed this card out to me (I'd previously overlooked it) and it is actually very nice; you can make Radiant Photon Paradios with it too! (And we all know how good that is ...) Something might be brewed with this card and Cyber Valley in the near(?) future (with Lightray Sorcerer too, perhaps).
I also like how Cosmo Blazer included the rest of Vetrix's/Tron's Heraldic Beasts to the OCG to make Heraldic King Genom-Heritage more playable, since Aberconway and Berner's Falcon weren't enough pre-Cosmo Blazar, IMO. Pyrorex might give some previous FIRE decks, like Lavals, more love. Flaming Stars and Haze Beasts do seem interesting, though.
And I also find it hard to believe that they made Kite's/Kaito's robot assistant into a card. And it's also good Galaxy and Photon support too, and it can be Tributed for Galaxy-Eyes in a pinch.