We all know Vanity Control, but we also all know that next to nobody plays it.
Yet, every time people see it being played, it wrecks almost everything.
So, I ask you, WHY?
It stops LS in its tracks by countering and booking everything that happens.
It stops BF by locking down both Black Whirlwind and crazy Swarming,
It stops J&D by just existing.
It stops GBs by just lurking in DEF position.
Zombies dont stand a chance.
So what's its big flaw? Why isnt it winning every tournament?
The answer is simple:
Too dependent on both rows.
Most decks are either Frontrow dependent or Backrow dependent, with a few other decks being Graveyard dependant(Zombies, Vaayu, and J&D), and others Hand dependent, such as BF. Backrow dependant decks include Anti-Meta
the biggest flaw with many deck ideas is that you rely too much on both rows.
For example, Vanity Control.
You rely on your front row for your large beaters with game slowing abilities, such as Raiou and the titular Vanity Fiend, but also on your backrow to do almost all your work for you in the form of Divine Wrath and Compulsary Evacuation Device.
This allows too many cards to open your weaknesses. One MST or storm, OR one Fissure or Lightning Vortex is enough to put a large gap in your and their momentum, unlike decks light Lightsworn, who tend to not give a damn about their own backrow.