I think people are a bit too worried about a 7-mana creature with an attack trigger ruining their formats, but this thing will take people down with the force of just slightly less than 10,000 suns
You can only use 1 "Vampire Bat Swarm" effect per turn, and only once that turn
When an attack is declared involving your opponent's monster: Change that opponent's monster's ATK to 0, negate its effects, also it cannot change its battle position
This can raise or lower the difficulty of some duels in comparison to their worldwide counterparts
My Verdict: This deck blends story, synergy, and meta staples
In Karador's case, this deck aims to either slowly drain away every opponent's life total to 0 or mill them with Altar of Dementia