If you do end up attacking with this biggie, it has the most scalable annihilator ability yet, and the only card with annihilator 6 is banned in Commander
For Twilight Masquerade, hit rates were changed to make getting hits more difficult which in turn increased the value of those harder to pull cards with them being more scarce
Then the sorcery is a five cost that gives your team vigilance, first strike, and another attack phase, so it's a better Relentless Assault variant hiding in your removal section
This is more than double the price of the identical card that was printed for the Obsidian Flames set, which this one comes from
Hurting one of your seven opponents' decks won't greatly increase your chances of beating an opponent at random
So, Wizards changed its mind at the last moment and used the original card back for Arabian Nights and all subsequent sets