Its a good ETB effect on a sizable creature, and it can keep fighting as more vampires enter
While Brionac, Dragon of the Ice Barrier would be banned in the TCG in its pre-errata form before this strategy was released, they can still access Synchros not many other strategies could like Gungnir, Dragon of the Ice Barrier, who offered card destruction while being able to trigger your effects, and Dewloren, Tiger King of the Ice Barrier to put Atlanteans back in the hand for discard fodder
Change of Heart, the anime classic that allows you to gain control of your opponents' monsters, is back in the game following its ban back in April 2005
Double mana changes everything
Then it fights up to one target creature an opponent controls
Dragonite/Articuno Deck For this deck youll want to open Genetic Apex Mewtwo packs for both Dragonite and regular Articuno